diff --git a/.gitignore b/.gitignore
index aa5f5c4..a9ae62d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,4 @@ node_modules/
 .DS_Store
 Thumbs.db
 
+current_pr.md
\ No newline at end of file
diff --git a/backend/main.py b/backend/main.py
index f21e7b9..fa7186a 100644
--- a/backend/main.py
+++ b/backend/main.py
@@ -10,6 +10,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from database import engine, get_db, Base
 from models import Counter, User, SumRecord, CounterRecord, Permission, Role, ROLE_REGULAR
+from validation import validate_profile_fields
 
 
 R = TypeVar("R", bound=BaseModel)
@@ -323,3 +324,85 @@ async def get_sum_records(
         per_page=per_page,
         total_pages=total_pages,
     )
+
+
+# Profile endpoints
+class ProfileResponse(BaseModel):
+    """Response model for profile data."""
+    contact_email: str | None
+    telegram: str | None
+    signal: str | None
+    nostr_npub: str | None
+
+
+class ProfileUpdate(BaseModel):
+    """Request model for updating profile."""
+    contact_email: str | None = None
+    telegram: str | None = None
+    signal: str | None = None
+    nostr_npub: str | None = None
+
+
+def require_regular_user():
+    """Dependency that requires the user to have the 'regular' role."""
+    async def checker(
+        current_user: User = Depends(get_current_user),
+    ) -> User:
+        if ROLE_REGULAR not in current_user.role_names:
+            raise HTTPException(
+                status_code=status.HTTP_403_FORBIDDEN,
+                detail="Profile access is only available to regular users",
+            )
+        return current_user
+    return checker
+
+
+@app.get("/api/profile", response_model=ProfileResponse)
+async def get_profile(
+    current_user: User = Depends(require_regular_user()),
+):
+    """Get the current user's profile (contact details)."""
+    return ProfileResponse(
+        contact_email=current_user.contact_email,
+        telegram=current_user.telegram,
+        signal=current_user.signal,
+        nostr_npub=current_user.nostr_npub,
+    )
+
+
+@app.put("/api/profile", response_model=ProfileResponse)
+async def update_profile(
+    data: ProfileUpdate,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_regular_user()),
+):
+    """Update the current user's profile (contact details)."""
+    # Validate all fields
+    errors = validate_profile_fields(
+        contact_email=data.contact_email,
+        telegram=data.telegram,
+        signal=data.signal,
+        nostr_npub=data.nostr_npub,
+    )
+    
+    if errors:
+        raise HTTPException(
+            status_code=422,
+            detail={"field_errors": errors},
+        )
+    
+    # Update fields
+    current_user.contact_email = data.contact_email
+    current_user.telegram = data.telegram
+    current_user.signal = data.signal
+    current_user.nostr_npub = data.nostr_npub
+    
+    await db.commit()
+    await db.refresh(current_user)
+    
+    return ProfileResponse(
+        contact_email=current_user.contact_email,
+        telegram=current_user.telegram,
+        signal=current_user.signal,
+        nostr_npub=current_user.nostr_npub,
+    )
diff --git a/backend/models.py b/backend/models.py
index 378157a..a08e755 100644
--- a/backend/models.py
+++ b/backend/models.py
@@ -101,6 +101,12 @@ class User(Base):
     email: Mapped[str] = mapped_column(String(255), unique=True, nullable=False, index=True)
     hashed_password: Mapped[str] = mapped_column(String(255), nullable=False)
     
+    # Contact details (all optional)
+    contact_email: Mapped[str | None] = mapped_column(String(255), nullable=True)
+    telegram: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    signal: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    nostr_npub: Mapped[str | None] = mapped_column(String(64), nullable=True)
+    
     # Relationship to roles
     roles: Mapped[list[Role]] = relationship(
         "Role",
diff --git a/backend/pyproject.toml b/backend/pyproject.toml
index 381017e..21359ac 100644
--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@@ -10,6 +10,7 @@ dependencies = [
     "bcrypt>=4.0.0",
     "python-jose[cryptography]>=3.3.0",
     "email-validator>=2.0.0",
+    "bech32>=1.2.0",
 ]
 
 [dependency-groups]
diff --git a/backend/seed.py b/backend/seed.py
index 185c2a6..45f7a09 100644
--- a/backend/seed.py
+++ b/backend/seed.py
@@ -67,6 +67,8 @@ async def upsert_user(db: AsyncSession, email: str, password: str, role_names: l
 
 async def seed() -> None:
     async with engine.begin() as conn:
+        # Drop all tables and recreate to ensure schema is up to date
+        await conn.run_sync(Base.metadata.drop_all)
         await conn.run_sync(Base.metadata.create_all)
 
     async with async_session() as db:
diff --git a/backend/tests/test_profile.py b/backend/tests/test_profile.py
new file mode 100644
index 0000000..5a45c56
--- /dev/null
+++ b/backend/tests/test_profile.py
@@ -0,0 +1,400 @@
+"""Tests for user profile and contact details."""
+import pytest
+from sqlalchemy import select
+
+from models import User, ROLE_REGULAR
+from auth import get_password_hash
+from tests.helpers import unique_email
+
+# Valid npub for testing (32 zero bytes encoded as bech32)
+VALID_NPUB = "npub1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzqujme"
+
+
+class TestUserContactFields:
+    """Test that contact fields work correctly on the User model."""
+
+    async def test_contact_fields_default_to_none(self, client_factory):
+        """New users should have all contact fields as None."""
+        email = unique_email("test")
+        
+        async with client_factory.get_db_session() as db:
+            user = User(
+                email=email,
+                hashed_password=get_password_hash("password123"),
+            )
+            db.add(user)
+            await db.commit()
+            await db.refresh(user)
+            
+            assert user.contact_email is None
+            assert user.telegram is None
+            assert user.signal is None
+            assert user.nostr_npub is None
+
+    async def test_contact_fields_can_be_set(self, client_factory):
+        """Contact fields can be set when creating a user."""
+        email = unique_email("test")
+        
+        async with client_factory.get_db_session() as db:
+            user = User(
+                email=email,
+                hashed_password=get_password_hash("password123"),
+                contact_email="contact@example.com",
+                telegram="@alice",
+                signal="alice.42",
+                nostr_npub="npub1test",
+            )
+            db.add(user)
+            await db.commit()
+            await db.refresh(user)
+            
+            assert user.contact_email == "contact@example.com"
+            assert user.telegram == "@alice"
+            assert user.signal == "alice.42"
+            assert user.nostr_npub == "npub1test"
+
+    async def test_contact_fields_persist_after_reload(self, client_factory):
+        """Contact fields should persist in the database."""
+        email = unique_email("test")
+        
+        async with client_factory.get_db_session() as db:
+            user = User(
+                email=email,
+                hashed_password=get_password_hash("password123"),
+                contact_email="contact@example.com",
+                telegram="@bob",
+                signal="bob.99",
+                nostr_npub="npub1xyz",
+            )
+            db.add(user)
+            await db.commit()
+            user_id = user.id
+        
+        # Reload from database in a new session
+        async with client_factory.get_db_session() as db:
+            result = await db.execute(select(User).where(User.id == user_id))
+            loaded_user = result.scalar_one()
+            
+            assert loaded_user.contact_email == "contact@example.com"
+            assert loaded_user.telegram == "@bob"
+            assert loaded_user.signal == "bob.99"
+            assert loaded_user.nostr_npub == "npub1xyz"
+
+    async def test_contact_fields_can_be_updated(self, client_factory):
+        """Contact fields can be updated after user creation."""
+        email = unique_email("test")
+        
+        async with client_factory.get_db_session() as db:
+            user = User(
+                email=email,
+                hashed_password=get_password_hash("password123"),
+            )
+            db.add(user)
+            await db.commit()
+            user_id = user.id
+        
+        # Update fields
+        async with client_factory.get_db_session() as db:
+            result = await db.execute(select(User).where(User.id == user_id))
+            user = result.scalar_one()
+            
+            user.contact_email = "new@example.com"
+            user.telegram = "@updated"
+            await db.commit()
+        
+        # Verify update persisted
+        async with client_factory.get_db_session() as db:
+            result = await db.execute(select(User).where(User.id == user_id))
+            user = result.scalar_one()
+            
+            assert user.contact_email == "new@example.com"
+            assert user.telegram == "@updated"
+            assert user.signal is None  # Still None
+            assert user.nostr_npub is None  # Still None
+
+    async def test_contact_fields_can_be_cleared(self, client_factory):
+        """Contact fields can be set back to None."""
+        email = unique_email("test")
+        
+        async with client_factory.get_db_session() as db:
+            user = User(
+                email=email,
+                hashed_password=get_password_hash("password123"),
+                contact_email="contact@example.com",
+                telegram="@alice",
+            )
+            db.add(user)
+            await db.commit()
+            user_id = user.id
+        
+        # Clear fields
+        async with client_factory.get_db_session() as db:
+            result = await db.execute(select(User).where(User.id == user_id))
+            user = result.scalar_one()
+            
+            user.contact_email = None
+            user.telegram = None
+            await db.commit()
+        
+        # Verify cleared
+        async with client_factory.get_db_session() as db:
+            result = await db.execute(select(User).where(User.id == user_id))
+            user = result.scalar_one()
+            
+            assert user.contact_email is None
+            assert user.telegram is None
+
+
+class TestGetProfileEndpoint:
+    """Tests for GET /api/profile endpoint."""
+
+    async def test_regular_user_can_get_profile(self, client_factory, regular_user):
+        """Regular user can fetch their profile."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.get("/api/profile")
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert "contact_email" in data
+        assert "telegram" in data
+        assert "signal" in data
+        assert "nostr_npub" in data
+        # All should be None for new user
+        assert data["contact_email"] is None
+        assert data["telegram"] is None
+        assert data["signal"] is None
+        assert data["nostr_npub"] is None
+
+    async def test_admin_user_cannot_access_profile(self, client_factory, admin_user):
+        """Admin user gets 403 when trying to access profile."""
+        async with client_factory.create(cookies=admin_user["cookies"]) as client:
+            response = await client.get("/api/profile")
+        
+        assert response.status_code == 403
+        assert "regular users" in response.json()["detail"].lower()
+
+    async def test_unauthenticated_user_gets_401(self, client_factory):
+        """Unauthenticated user gets 401."""
+        async with client_factory.create() as client:
+            response = await client.get("/api/profile")
+        
+        assert response.status_code == 401
+
+    async def test_profile_returns_existing_data(self, client_factory, regular_user):
+        """Profile returns data that was previously set."""
+        # Set some data directly in DB
+        async with client_factory.get_db_session() as db:
+            result = await db.execute(
+                select(User).where(User.email == regular_user["email"])
+            )
+            user = result.scalar_one()
+            user.contact_email = "contact@test.com"
+            user.telegram = "@testuser"
+            await db.commit()
+        
+        # Fetch via API
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.get("/api/profile")
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert data["contact_email"] == "contact@test.com"
+        assert data["telegram"] == "@testuser"
+        assert data["signal"] is None
+        assert data["nostr_npub"] is None
+
+
+class TestUpdateProfileEndpoint:
+    """Tests for PUT /api/profile endpoint."""
+
+    async def test_regular_user_can_update_profile(self, client_factory, regular_user):
+        """Regular user can update their profile."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": "new@example.com",
+                    "telegram": "@newhandle",
+                    "signal": "signal.42",
+                    "nostr_npub": VALID_NPUB,
+                },
+            )
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert data["contact_email"] == "new@example.com"
+        assert data["telegram"] == "@newhandle"
+        assert data["signal"] == "signal.42"
+        assert data["nostr_npub"] == VALID_NPUB
+
+    async def test_profile_update_persists(self, client_factory, regular_user):
+        """Profile updates persist in the database."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            await client.put(
+                "/api/profile",
+                json={"telegram": "@persisted"},
+            )
+            
+            # Fetch again to verify
+            response = await client.get("/api/profile")
+        
+        assert response.status_code == 200
+        assert response.json()["telegram"] == "@persisted"
+
+    async def test_admin_user_cannot_update_profile(self, client_factory, admin_user):
+        """Admin user gets 403 when trying to update profile."""
+        async with client_factory.create(cookies=admin_user["cookies"]) as client:
+            response = await client.put(
+                "/api/profile",
+                json={"telegram": "@admin"},
+            )
+        
+        assert response.status_code == 403
+
+    async def test_unauthenticated_user_gets_401(self, client_factory):
+        """Unauthenticated user gets 401."""
+        async with client_factory.create() as client:
+            response = await client.put(
+                "/api/profile",
+                json={"telegram": "@test"},
+            )
+        
+        assert response.status_code == 401
+
+    async def test_can_clear_fields(self, client_factory, regular_user):
+        """User can clear fields by setting them to null."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            # First set some values
+            await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": "test@example.com",
+                    "telegram": "@test",
+                },
+            )
+            
+            # Then clear them
+            response = await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": None,
+                    "telegram": None,
+                    "signal": None,
+                    "nostr_npub": None,
+                },
+            )
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert data["contact_email"] is None
+        assert data["telegram"] is None
+
+    async def test_invalid_email_returns_422(self, client_factory, regular_user):
+        """Invalid email format returns 422 with field error."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.put(
+                "/api/profile",
+                json={"contact_email": "not-an-email"},
+            )
+        
+        assert response.status_code == 422
+        data = response.json()
+        assert "field_errors" in data["detail"]
+        assert "contact_email" in data["detail"]["field_errors"]
+
+    async def test_invalid_telegram_returns_422(self, client_factory, regular_user):
+        """Invalid telegram handle returns 422 with field error."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.put(
+                "/api/profile",
+                json={"telegram": "missing_at_sign"},
+            )
+        
+        assert response.status_code == 422
+        data = response.json()
+        assert "field_errors" in data["detail"]
+        assert "telegram" in data["detail"]["field_errors"]
+
+    async def test_invalid_npub_returns_422(self, client_factory, regular_user):
+        """Invalid nostr npub returns 422 with field error."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.put(
+                "/api/profile",
+                json={"nostr_npub": "npub1invalid"},
+            )
+        
+        assert response.status_code == 422
+        data = response.json()
+        assert "field_errors" in data["detail"]
+        assert "nostr_npub" in data["detail"]["field_errors"]
+
+    async def test_multiple_invalid_fields_returns_all_errors(self, client_factory, regular_user):
+        """Multiple invalid fields return all errors."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            response = await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": "bad-email",
+                    "telegram": "no-at",
+                },
+            )
+        
+        assert response.status_code == 422
+        data = response.json()
+        assert "contact_email" in data["detail"]["field_errors"]
+        assert "telegram" in data["detail"]["field_errors"]
+
+    async def test_partial_update_preserves_other_fields(self, client_factory, regular_user):
+        """Updating one field doesn't affect others (they get set to the request values)."""
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            # Set initial values
+            await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": "initial@example.com",
+                    "telegram": "@initial",
+                },
+            )
+            
+            # Update only telegram, but note: PUT replaces all fields
+            # So we need to include all fields we want to keep
+            response = await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": "initial@example.com",
+                    "telegram": "@updated",
+                },
+            )
+        
+        assert response.status_code == 200
+        data = response.json()
+        assert data["contact_email"] == "initial@example.com"
+        assert data["telegram"] == "@updated"
+
+
+class TestProfilePrivacy:
+    """Tests to ensure profile data is private."""
+
+    async def test_profile_not_in_auth_me(self, client_factory, regular_user):
+        """Contact details should NOT appear in /api/auth/me response."""
+        # First set some profile data
+        async with client_factory.create(cookies=regular_user["cookies"]) as client:
+            await client.put(
+                "/api/profile",
+                json={
+                    "contact_email": "secret@example.com",
+                    "telegram": "@secret",
+                },
+            )
+            
+            # Check /api/auth/me doesn't expose it
+            response = await client.get("/api/auth/me")
+        
+        assert response.status_code == 200
+        data = response.json()
+        # These fields should NOT be in the response
+        assert "contact_email" not in data
+        assert "telegram" not in data
+        assert "signal" not in data
+        assert "nostr_npub" not in data
+
diff --git a/backend/tests/test_validation.py b/backend/tests/test_validation.py
new file mode 100644
index 0000000..3bcebaf
--- /dev/null
+++ b/backend/tests/test_validation.py
@@ -0,0 +1,215 @@
+"""Tests for profile field validation."""
+import pytest
+
+from validation import (
+    validate_contact_email,
+    validate_telegram,
+    validate_signal,
+    validate_nostr_npub,
+    validate_profile_fields,
+)
+
+
+class TestValidateContactEmail:
+    """Tests for contact email validation."""
+
+    def test_none_is_valid(self):
+        assert validate_contact_email(None) is None
+
+    def test_empty_string_is_valid(self):
+        assert validate_contact_email("") is None
+
+    def test_valid_email(self):
+        assert validate_contact_email("user@example.com") is None
+
+    def test_valid_email_with_plus(self):
+        assert validate_contact_email("user+tag@example.com") is None
+
+    def test_valid_email_subdomain(self):
+        assert validate_contact_email("user@mail.example.com") is None
+
+    def test_invalid_email_no_at(self):
+        result = validate_contact_email("userexample.com")
+        assert result is not None
+        assert "not valid" in result.lower() or "@" in result
+
+    def test_invalid_email_no_domain(self):
+        result = validate_contact_email("user@")
+        assert result is not None
+
+    def test_invalid_email_spaces(self):
+        result = validate_contact_email("user @example.com")
+        assert result is not None
+
+
+class TestValidateTelegram:
+    """Tests for Telegram handle validation."""
+
+    def test_none_is_valid(self):
+        assert validate_telegram(None) is None
+
+    def test_empty_string_is_valid(self):
+        assert validate_telegram("") is None
+
+    def test_valid_handle(self):
+        assert validate_telegram("@alice") is None
+
+    def test_valid_handle_with_numbers(self):
+        assert validate_telegram("@alice123") is None
+
+    def test_valid_handle_with_underscore(self):
+        assert validate_telegram("@alice_bob") is None
+
+    def test_valid_handle_min_length(self):
+        # 5 characters after @
+        assert validate_telegram("@abcde") is None
+
+    def test_valid_handle_max_length(self):
+        # 32 characters after @
+        assert validate_telegram("@" + "a" * 32) is None
+
+    def test_missing_at_prefix(self):
+        result = validate_telegram("alice")
+        assert result is not None
+        assert "@" in result
+
+    def test_just_at_sign(self):
+        result = validate_telegram("@")
+        assert result is not None
+
+    def test_too_short(self):
+        # Less than 5 characters after @
+        result = validate_telegram("@abcd")
+        assert result is not None
+        assert "5" in result
+
+    def test_too_long(self):
+        # More than 32 characters after @
+        result = validate_telegram("@" + "a" * 33)
+        assert result is not None
+        assert "32" in result
+
+    def test_starts_with_number(self):
+        result = validate_telegram("@1alice")
+        assert result is not None
+        assert "letter" in result.lower()
+
+    def test_invalid_characters(self):
+        result = validate_telegram("@alice-bob")
+        assert result is not None
+
+
+class TestValidateSignal:
+    """Tests for Signal username validation."""
+
+    def test_none_is_valid(self):
+        assert validate_signal(None) is None
+
+    def test_empty_string_is_valid(self):
+        assert validate_signal("") is None
+
+    def test_valid_username(self):
+        assert validate_signal("alice.42") is None
+
+    def test_valid_simple_username(self):
+        assert validate_signal("alice") is None
+
+    def test_valid_with_numbers(self):
+        assert validate_signal("alice123") is None
+
+    def test_whitespace_only_invalid(self):
+        result = validate_signal("   ")
+        assert result is not None
+        assert "empty" in result.lower()
+
+    def test_too_long(self):
+        result = validate_signal("a" * 65)
+        assert result is not None
+        assert "64" in result
+
+
+class TestValidateNostrNpub:
+    """Tests for Nostr npub validation."""
+
+    # Valid npub for testing (32 zero bytes encoded as bech32)
+    VALID_NPUB = "npub1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzqujme"
+
+    def test_none_is_valid(self):
+        assert validate_nostr_npub(None) is None
+
+    def test_empty_string_is_valid(self):
+        assert validate_nostr_npub("") is None
+
+    def test_valid_npub(self):
+        # Generate a valid npub for testing
+        # This is the npub for 32 zero bytes
+        assert validate_nostr_npub(self.VALID_NPUB) is None
+
+    def test_wrong_prefix(self):
+        result = validate_nostr_npub("nsec1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqwcv5dz")
+        assert result is not None
+        assert "npub" in result.lower()
+
+    def test_invalid_checksum(self):
+        # Change last character to break checksum
+        result = validate_nostr_npub("npub1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqsutgpd")
+        assert result is not None
+        assert "checksum" in result.lower()
+
+    def test_too_short(self):
+        result = validate_nostr_npub("npub1short")
+        assert result is not None
+
+    def test_not_starting_with_npub1(self):
+        result = validate_nostr_npub("npub2qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqsutgpc")
+        assert result is not None
+        assert "npub1" in result
+
+    def test_random_string(self):
+        result = validate_nostr_npub("not_a_valid_npub_at_all")
+        assert result is not None
+
+
+class TestValidateProfileFields:
+    """Tests for validating all profile fields together."""
+
+    def test_all_none_is_valid(self):
+        errors = validate_profile_fields()
+        assert errors == {}
+
+    def test_all_valid(self):
+        errors = validate_profile_fields(
+            contact_email="user@example.com",
+            telegram="@alice",
+            signal="alice.42",
+            nostr_npub="npub1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzqujme",
+        )
+        assert errors == {}
+
+    def test_single_invalid_field(self):
+        errors = validate_profile_fields(
+            contact_email="user@example.com",
+            telegram="alice",  # Missing @
+            signal="alice.42",
+        )
+        assert "telegram" in errors
+        assert len(errors) == 1
+
+    def test_multiple_invalid_fields(self):
+        errors = validate_profile_fields(
+            contact_email="not-an-email",
+            telegram="alice",  # Missing @
+        )
+        assert "contact_email" in errors
+        assert "telegram" in errors
+        assert len(errors) == 2
+
+    def test_empty_values_are_valid(self):
+        errors = validate_profile_fields(
+            contact_email="",
+            telegram="",
+            signal="",
+            nostr_npub="",
+        )
+        assert errors == {}
+
diff --git a/backend/validation.py b/backend/validation.py
new file mode 100644
index 0000000..e7c5d39
--- /dev/null
+++ b/backend/validation.py
@@ -0,0 +1,135 @@
+"""Validation utilities for user profile fields."""
+import re
+from email_validator import validate_email, EmailNotValidError
+from bech32 import bech32_decode
+
+
+def validate_contact_email(value: str | None) -> str | None:
+    """
+    Validate contact email format.
+    
+    Returns None if valid, error message if invalid.
+    Empty/None values are valid (field is optional).
+    """
+    if not value:
+        return None
+    
+    try:
+        validate_email(value, check_deliverability=False)
+        return None
+    except EmailNotValidError as e:
+        return str(e)
+
+
+def validate_telegram(value: str | None) -> str | None:
+    """
+    Validate Telegram handle.
+    
+    Must start with @ if provided.
+    Returns None if valid, error message if invalid.
+    Empty/None values are valid (field is optional).
+    """
+    if not value:
+        return None
+    
+    if not value.startswith("@"):
+        return "Telegram handle must start with @"
+    
+    if len(value) < 2:
+        return "Telegram handle must have at least one character after @"
+    
+    # Telegram usernames: 5-32 characters, alphanumeric and underscores
+    # But we store with @, so check 6-33 total
+    handle = value[1:]  # Remove @
+    if len(handle) < 5:
+        return "Telegram handle must be at least 5 characters (after @)"
+    
+    if len(handle) > 32:
+        return "Telegram handle must be at most 32 characters (after @)"
+    
+    if not re.match(r'^[a-zA-Z][a-zA-Z0-9_]*$', handle):
+        return "Telegram handle must start with a letter and contain only letters, numbers, and underscores"
+    
+    return None
+
+
+def validate_signal(value: str | None) -> str | None:
+    """
+    Validate Signal username.
+    
+    Any non-empty string is valid.
+    Returns None if valid, error message if invalid.
+    Empty/None values are valid (field is optional).
+    """
+    if not value:
+        return None
+    
+    # Signal usernames are fairly permissive, just check it's not empty
+    if len(value.strip()) == 0:
+        return "Signal username cannot be empty"
+    
+    if len(value) > 64:
+        return "Signal username must be at most 64 characters"
+    
+    return None
+
+
+def validate_nostr_npub(value: str | None) -> str | None:
+    """
+    Validate Nostr npub (public key in bech32 format).
+    
+    Must be valid bech32 with 'npub' prefix.
+    Returns None if valid, error message if invalid.
+    Empty/None values are valid (field is optional).
+    """
+    if not value:
+        return None
+    
+    if not value.startswith("npub1"):
+        return "Nostr npub must start with 'npub1'"
+    
+    # Decode bech32 to validate checksum
+    hrp, data = bech32_decode(value)
+    
+    if hrp is None or data is None:
+        return "Invalid Nostr npub: bech32 checksum failed"
+    
+    if hrp != "npub":
+        return "Nostr npub must have 'npub' prefix"
+    
+    # npub should decode to 32 bytes (256 bits) for a public key
+    # In bech32, each character encodes 5 bits, so 32 bytes = 52 characters of data
+    if len(data) != 52:
+        return "Invalid Nostr npub: incorrect length"
+    
+    return None
+
+
+def validate_profile_fields(
+    contact_email: str | None = None,
+    telegram: str | None = None,
+    signal: str | None = None,
+    nostr_npub: str | None = None,
+) -> dict[str, str]:
+    """
+    Validate all profile fields at once.
+    
+    Returns a dict of field_name -> error_message for any invalid fields.
+    Empty dict means all fields are valid.
+    """
+    errors: dict[str, str] = {}
+    
+    if err := validate_contact_email(contact_email):
+        errors["contact_email"] = err
+    
+    if err := validate_telegram(telegram):
+        errors["telegram"] = err
+    
+    if err := validate_signal(signal):
+        errors["signal"] = err
+    
+    if err := validate_nostr_npub(nostr_npub):
+        errors["nostr_npub"] = err
+    
+    return errors
+
diff --git a/frontend/app/page.test.tsx b/frontend/app/page.test.tsx
index 36babb4..1a3ff04 100644
--- a/frontend/app/page.test.tsx
+++ b/frontend/app/page.test.tsx
@@ -22,6 +22,9 @@ const mockLogout = vi.fn();
 const mockHasPermission = vi.fn((permission: string) => 
   mockUser?.permissions.includes(permission) ?? false
 );
+const mockHasRole = vi.fn((role: string) => 
+  mockUser?.roles.includes(role) ?? false
+);
 
 vi.mock("./auth-context", () => ({
   useAuth: () => ({
@@ -29,6 +32,7 @@ vi.mock("./auth-context", () => ({
     isLoading: mockIsLoading,
     logout: mockLogout,
     hasPermission: mockHasPermission,
+    hasRole: mockHasRole,
   }),
   Permission: {
     VIEW_COUNTER: "view_counter",
@@ -51,6 +55,9 @@ beforeEach(() => {
   mockHasPermission.mockImplementation((permission: string) =>
     mockUser?.permissions.includes(permission) ?? false
   );
+  mockHasRole.mockImplementation((role: string) =>
+    mockUser?.roles.includes(role) ?? false
+  );
 });
 
 afterEach(() => {
@@ -217,3 +224,38 @@ describe("Home - Loading State", () => {
     expect(screen.getByText("Loading...")).toBeDefined();
   });
 });
+
+describe("Home - Navigation", () => {
+  test("shows My Profile link for regular user", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      json: () => Promise.resolve({ value: 0 }),
+    } as Response);
+
+    render(<Home />);
+    
+    await waitFor(() => {
+      expect(screen.getByText("My Profile")).toBeDefined();
+    });
+  });
+
+  test("does not show My Profile link for admin user", async () => {
+    mockUser = {
+      id: 1,
+      email: "admin@example.com",
+      roles: ["admin"],
+      permissions: ["view_counter", "view_audit"],
+    };
+
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      json: () => Promise.resolve({ value: 0 }),
+    } as Response);
+
+    render(<Home />);
+    
+    // Wait for render, then check profile link is not present
+    await waitFor(() => {
+      expect(screen.getByText("Counter")).toBeDefined();
+    });
+    expect(screen.queryByText("My Profile")).toBeNull();
+  });
+});
diff --git a/frontend/app/page.tsx b/frontend/app/page.tsx
index 0b71a1f..aecf66d 100644
--- a/frontend/app/page.tsx
+++ b/frontend/app/page.tsx
@@ -8,10 +8,11 @@ import { sharedStyles } from "./styles/shared";
 
 export default function Home() {
   const [count, setCount] = useState<number | null>(null);
-  const { user, isLoading, logout, hasPermission } = useAuth();
+  const { user, isLoading, logout, hasPermission, hasRole } = useAuth();
   const router = useRouter();
 
   const canViewCounter = hasPermission(Permission.VIEW_COUNTER);
+  const isRegularUser = hasRole("regular");
 
   useEffect(() => {
     if (!isLoading) {
@@ -68,6 +69,12 @@ export default function Home() {
           <span style={styles.navCurrent}>Counter</span>
           <span style={styles.navDivider}>•</span>
           <a href="/sum" style={styles.navLink}>Sum</a>
+          {isRegularUser && (
+            <>
+              <span style={styles.navDivider}>•</span>
+              <a href="/profile" style={styles.navLink}>My Profile</a>
+            </>
+          )}
         </div>
         <div style={styles.userInfo}>
           <span style={styles.userEmail}>{user.email}</span>
diff --git a/frontend/app/profile/page.test.tsx b/frontend/app/profile/page.test.tsx
new file mode 100644
index 0000000..dd8843f
--- /dev/null
+++ b/frontend/app/profile/page.test.tsx
@@ -0,0 +1,594 @@
+import { render, screen, waitFor, cleanup, fireEvent } from "@testing-library/react";
+import { expect, test, vi, beforeEach, afterEach, describe } from "vitest";
+import ProfilePage from "./page";
+
+// Mock next/navigation
+const mockPush = vi.fn();
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({
+    push: mockPush,
+  }),
+}));
+
+// Default mock values
+let mockUser: { id: number; email: string; roles: string[]; permissions: string[] } | null = {
+  id: 1,
+  email: "test@example.com",
+  roles: ["regular"],
+  permissions: ["view_counter", "increment_counter", "use_sum"],
+};
+let mockIsLoading = false;
+const mockLogout = vi.fn();
+const mockHasRole = vi.fn((role: string) => mockUser?.roles.includes(role) ?? false);
+
+vi.mock("../auth-context", () => ({
+  useAuth: () => ({
+    user: mockUser,
+    isLoading: mockIsLoading,
+    logout: mockLogout,
+    hasRole: mockHasRole,
+  }),
+}));
+
+// Mock profile data
+const mockProfileData = {
+  contact_email: "contact@example.com",
+  telegram: "@testuser",
+  signal: "signal.42",
+  nostr_npub: "npub1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzqujme",
+};
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  // Reset to authenticated regular user
+  mockUser = {
+    id: 1,
+    email: "test@example.com",
+    roles: ["regular"],
+    permissions: ["view_counter", "increment_counter", "use_sum"],
+  };
+  mockIsLoading = false;
+  mockHasRole.mockImplementation((role: string) => mockUser?.roles.includes(role) ?? false);
+});
+
+afterEach(() => {
+  cleanup();
+});
+
+describe("ProfilePage - Display", () => {
+  test("renders loading state initially", () => {
+    mockIsLoading = true;
+    vi.spyOn(global, "fetch").mockImplementation(() => new Promise(() => {}));
+
+    render(<ProfilePage />);
+    expect(screen.getByText("Loading...")).toBeDefined();
+  });
+
+  test("renders profile page title", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+  });
+
+  test("displays login email as read-only", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      const loginEmailInput = screen.getByDisplayValue("test@example.com");
+      expect(loginEmailInput).toBeDefined();
+      expect(loginEmailInput).toHaveProperty("disabled", true);
+    });
+  });
+
+  test("shows read-only badge for login email", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      expect(screen.getByText("Read only")).toBeDefined();
+    });
+  });
+
+  test("shows hint about login email", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      expect(screen.getByText(/cannot be changed/i)).toBeDefined();
+    });
+  });
+
+  test("displays contact details section hint", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      expect(screen.getByText(/communication purposes only/i)).toBeDefined();
+    });
+  });
+
+  test("displays fetched profile data", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      expect(screen.getByDisplayValue("contact@example.com")).toBeDefined();
+      expect(screen.getByDisplayValue("@testuser")).toBeDefined();
+      expect(screen.getByDisplayValue("signal.42")).toBeDefined();
+      expect(screen.getByDisplayValue(mockProfileData.nostr_npub)).toBeDefined();
+    });
+  });
+
+  test("fetches profile with credentials", async () => {
+    const fetchSpy = vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+
+    await waitFor(() => {
+      expect(fetchSpy).toHaveBeenCalledWith(
+        "http://localhost:8000/api/profile",
+        expect.objectContaining({
+          credentials: "include",
+        })
+      );
+    });
+  });
+
+  test("displays empty fields when profile has null values", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        contact_email: null,
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      }),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      // Check that inputs exist with empty values (placeholders shown)
+      const telegramInput = document.getElementById("telegram") as HTMLInputElement;
+      expect(telegramInput.value).toBe("");
+    });
+  });
+});
+
+describe("ProfilePage - Navigation", () => {
+  test("shows nav links for regular user", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      expect(screen.getByText("Counter")).toBeDefined();
+      expect(screen.getByText("Sum")).toBeDefined();
+    });
+  });
+
+  test("highlights My Profile in nav", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      // My Profile should be visible (as current page indicator)
+      const navItems = screen.getAllByText("My Profile");
+      expect(navItems.length).toBeGreaterThan(0);
+    });
+  });
+});
+
+describe("ProfilePage - Access Control", () => {
+  test("redirects to login when not authenticated", async () => {
+    mockUser = null;
+
+    render(<ProfilePage />);
+
+    await waitFor(() => {
+      expect(mockPush).toHaveBeenCalledWith("/login");
+    });
+  });
+
+  test("redirects admin to audit page", async () => {
+    mockUser = {
+      id: 1,
+      email: "admin@example.com",
+      roles: ["admin"],
+      permissions: ["view_audit"],
+    };
+
+    render(<ProfilePage />);
+
+    await waitFor(() => {
+      expect(mockPush).toHaveBeenCalledWith("/audit");
+    });
+  });
+
+  test("does not fetch profile for admin user", async () => {
+    mockUser = {
+      id: 1,
+      email: "admin@example.com",
+      roles: ["admin"],
+      permissions: ["view_audit"],
+    };
+    const fetchSpy = vi.spyOn(global, "fetch");
+
+    render(<ProfilePage />);
+
+    // Give it a moment to potentially fetch
+    await new Promise((r) => setTimeout(r, 100));
+    expect(fetchSpy).not.toHaveBeenCalled();
+  });
+});
+
+describe("ProfilePage - Loading State", () => {
+  test("does not redirect while loading", () => {
+    mockIsLoading = true;
+    mockUser = null;
+
+    render(<ProfilePage />);
+
+    expect(mockPush).not.toHaveBeenCalled();
+  });
+
+  test("shows loading indicator while loading", () => {
+    mockIsLoading = true;
+
+    render(<ProfilePage />);
+
+    expect(screen.getByText("Loading...")).toBeDefined();
+  });
+});
+
+describe("ProfilePage - Form Behavior", () => {
+  test("submit button is disabled when no changes", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    await waitFor(() => {
+      const submitButton = screen.getByRole("button", { name: /save changes/i });
+      expect(submitButton).toHaveProperty("disabled", true);
+    });
+  });
+
+  test("submit button is enabled after field changes", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve(mockProfileData),
+    } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByDisplayValue("@testuser")).toBeDefined();
+    });
+
+    const telegramInput = screen.getByDisplayValue("@testuser");
+    fireEvent.change(telegramInput, { target: { value: "@newhandle" } });
+
+    await waitFor(() => {
+      const submitButton = screen.getByRole("button", { name: /save changes/i });
+      expect(submitButton).toHaveProperty("disabled", false);
+    });
+  });
+
+  test("shows inline error for invalid telegram handle", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        contact_email: null,
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      }),
+    } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    const telegramInput = document.getElementById("telegram") as HTMLInputElement;
+    fireEvent.change(telegramInput, { target: { value: "noatsign" } });
+
+    await waitFor(() => {
+      expect(screen.getByText(/must start with @/i)).toBeDefined();
+    });
+  });
+
+  test("shows inline error for invalid npub", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        contact_email: null,
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      }),
+    } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    const npubInput = document.getElementById("nostr_npub") as HTMLInputElement;
+    fireEvent.change(npubInput, { target: { value: "invalidnpub" } });
+
+    await waitFor(() => {
+      expect(screen.getByText(/must start with 'npub1'/i)).toBeDefined();
+    });
+  });
+
+  test("submit button is disabled when form has validation errors", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        contact_email: null,
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      }),
+    } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    // Enter invalid telegram (no @)
+    const telegramInput = document.getElementById("telegram") as HTMLInputElement;
+    fireEvent.change(telegramInput, { target: { value: "noatsign" } });
+
+    await waitFor(() => {
+      const submitButton = screen.getByRole("button", { name: /save changes/i });
+      expect(submitButton).toHaveProperty("disabled", true);
+    });
+  });
+
+  test("clears error when field becomes valid", async () => {
+    vi.spyOn(global, "fetch").mockResolvedValue({
+      ok: true,
+      json: () => Promise.resolve({
+        contact_email: null,
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      }),
+    } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    const telegramInput = document.getElementById("telegram") as HTMLInputElement;
+    
+    // First enter invalid value
+    fireEvent.change(telegramInput, { target: { value: "noat" } });
+    await waitFor(() => {
+      expect(screen.getByText(/must start with @/i)).toBeDefined();
+    });
+
+    // Then fix it
+    fireEvent.change(telegramInput, { target: { value: "@validhandle" } });
+    await waitFor(() => {
+      expect(screen.queryByText(/must start with @/i)).toBeNull();
+    });
+  });
+});
+
+describe("ProfilePage - Form Submission", () => {
+  test("shows success toast after successful save", async () => {
+    const fetchSpy = vi.spyOn(global, "fetch")
+      .mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({
+          contact_email: null,
+          telegram: null,
+          signal: null,
+          nostr_npub: null,
+        }),
+      } as Response)
+      .mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({
+          contact_email: "new@example.com",
+          telegram: null,
+          signal: null,
+          nostr_npub: null,
+        }),
+      } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    // Change email
+    const emailInput = document.getElementById("contact_email") as HTMLInputElement;
+    fireEvent.change(emailInput, { target: { value: "new@example.com" } });
+
+    // Submit
+    const submitButton = screen.getByRole("button", { name: /save changes/i });
+    fireEvent.click(submitButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(/saved successfully/i)).toBeDefined();
+    });
+
+    // Verify PUT was called
+    expect(fetchSpy).toHaveBeenCalledWith(
+      "http://localhost:8000/api/profile",
+      expect.objectContaining({
+        method: "PUT",
+        credentials: "include",
+      })
+    );
+  });
+
+  test("shows inline errors from backend validation", async () => {
+    vi.spyOn(global, "fetch")
+      .mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({
+          contact_email: null,
+          telegram: null,
+          signal: null,
+          nostr_npub: null,
+        }),
+      } as Response)
+      .mockResolvedValueOnce({
+        ok: false,
+        status: 422,
+        json: () => Promise.resolve({
+          detail: {
+            field_errors: {
+              telegram: "Backend error: invalid handle",
+            },
+          },
+        }),
+      } as Response);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    // Enter a value that passes frontend validation but fails backend
+    const telegramInput = document.getElementById("telegram") as HTMLInputElement;
+    fireEvent.change(telegramInput, { target: { value: "@validfrontend" } });
+
+    // Submit
+    const submitButton = screen.getByRole("button", { name: /save changes/i });
+    fireEvent.click(submitButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(/backend error/i)).toBeDefined();
+    });
+  });
+
+  test("shows error toast on network failure", async () => {
+    vi.spyOn(global, "fetch")
+      .mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({
+          contact_email: null,
+          telegram: null,
+          signal: null,
+          nostr_npub: null,
+        }),
+      } as Response)
+      .mockRejectedValueOnce(new Error("Network error"));
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    // Change something
+    const emailInput = document.getElementById("contact_email") as HTMLInputElement;
+    fireEvent.change(emailInput, { target: { value: "new@example.com" } });
+
+    // Submit
+    const submitButton = screen.getByRole("button", { name: /save changes/i });
+    fireEvent.click(submitButton);
+
+    await waitFor(() => {
+      expect(screen.getByText(/network error/i)).toBeDefined();
+    });
+  });
+
+  test("submit button shows 'Saving...' while submitting", async () => {
+    let resolveSubmit: (value: Response) => void;
+    const submitPromise = new Promise<Response>((resolve) => {
+      resolveSubmit = resolve;
+    });
+
+    vi.spyOn(global, "fetch")
+      .mockResolvedValueOnce({
+        ok: true,
+        json: () => Promise.resolve({
+          contact_email: null,
+          telegram: null,
+          signal: null,
+          nostr_npub: null,
+        }),
+      } as Response)
+      .mockReturnValueOnce(submitPromise as Promise<Response>);
+
+    render(<ProfilePage />);
+    
+    await waitFor(() => {
+      expect(screen.getByRole("heading", { name: "My Profile" })).toBeDefined();
+    });
+
+    // Change something
+    const emailInput = document.getElementById("contact_email") as HTMLInputElement;
+    fireEvent.change(emailInput, { target: { value: "new@example.com" } });
+
+    // Submit
+    const submitButton = screen.getByRole("button", { name: /save changes/i });
+    fireEvent.click(submitButton);
+
+    await waitFor(() => {
+      expect(screen.getByText("Saving...")).toBeDefined();
+    });
+
+    // Resolve the promise
+    resolveSubmit!({
+      ok: true,
+      json: () => Promise.resolve({
+        contact_email: "new@example.com",
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      }),
+    } as Response);
+
+    await waitFor(() => {
+      expect(screen.getByRole("button", { name: /save changes/i })).toBeDefined();
+    });
+  });
+});
+
diff --git a/frontend/app/profile/page.tsx b/frontend/app/profile/page.tsx
new file mode 100644
index 0000000..68584ce
--- /dev/null
+++ b/frontend/app/profile/page.tsx
@@ -0,0 +1,575 @@
+"use client";
+
+import { useEffect, useState, useCallback } from "react";
+import { useRouter } from "next/navigation";
+import { useAuth } from "../auth-context";
+import { API_URL } from "../config";
+import { sharedStyles } from "../styles/shared";
+
+interface ProfileData {
+  contact_email: string | null;
+  telegram: string | null;
+  signal: string | null;
+  nostr_npub: string | null;
+}
+
+interface FormData {
+  contact_email: string;
+  telegram: string;
+  signal: string;
+  nostr_npub: string;
+}
+
+interface FieldErrors {
+  contact_email?: string;
+  telegram?: string;
+  signal?: string;
+  nostr_npub?: string;
+}
+
+// Client-side validation matching backend rules
+function validateEmail(value: string): string | undefined {
+  if (!value) return undefined;
+  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+  if (!emailRegex.test(value)) {
+    return "Please enter a valid email address";
+  }
+  return undefined;
+}
+
+function validateTelegram(value: string): string | undefined {
+  if (!value) return undefined;
+  if (!value.startsWith("@")) {
+    return "Telegram handle must start with @";
+  }
+  const handle = value.slice(1);
+  if (handle.length < 5) {
+    return "Telegram handle must be at least 5 characters (after @)";
+  }
+  if (handle.length > 32) {
+    return "Telegram handle must be at most 32 characters (after @)";
+  }
+  if (!/^[a-zA-Z][a-zA-Z0-9_]*$/.test(handle)) {
+    return "Telegram handle must start with a letter and contain only letters, numbers, and underscores";
+  }
+  return undefined;
+}
+
+function validateSignal(value: string): string | undefined {
+  if (!value) return undefined;
+  if (value.trim().length === 0) {
+    return "Signal username cannot be empty";
+  }
+  if (value.length > 64) {
+    return "Signal username must be at most 64 characters";
+  }
+  return undefined;
+}
+
+function validateNostrNpub(value: string): string | undefined {
+  if (!value) return undefined;
+  if (!value.startsWith("npub1")) {
+    return "Nostr npub must start with 'npub1'";
+  }
+  // Basic length check (valid npubs are 63 characters)
+  if (value.length !== 63) {
+    return "Invalid Nostr npub format";
+  }
+  // Check for valid bech32 characters
+  if (!/^npub1[023456789acdefghjklmnpqrstuvwxyz]+$/.test(value)) {
+    return "Invalid Nostr npub: contains invalid characters";
+  }
+  return undefined;
+}
+
+function validateForm(data: FormData): FieldErrors {
+  const errors: FieldErrors = {};
+  const emailError = validateEmail(data.contact_email);
+  if (emailError) errors.contact_email = emailError;
+  const telegramError = validateTelegram(data.telegram);
+  if (telegramError) errors.telegram = telegramError;
+  const signalError = validateSignal(data.signal);
+  if (signalError) errors.signal = signalError;
+  const npubError = validateNostrNpub(data.nostr_npub);
+  if (npubError) errors.nostr_npub = npubError;
+  return errors;
+}
+
+export default function ProfilePage() {
+  const { user, isLoading, logout, hasRole } = useAuth();
+  const router = useRouter();
+  const [originalData, setOriginalData] = useState<FormData | null>(null);
+  const [formData, setFormData] = useState<FormData>({
+    contact_email: "",
+    telegram: "",
+    signal: "",
+    nostr_npub: "",
+  });
+  const [errors, setErrors] = useState<FieldErrors>({});
+  const [isLoadingProfile, setIsLoadingProfile] = useState(true);
+  const [isSubmitting, setIsSubmitting] = useState(false);
+  const [toast, setToast] = useState<{ message: string; type: "success" | "error" } | null>(null);
+
+  const isRegularUser = hasRole("regular");
+
+  // Check if form has changes
+  const hasChanges = useCallback(() => {
+    if (!originalData) return false;
+    return (
+      formData.contact_email !== originalData.contact_email ||
+      formData.telegram !== originalData.telegram ||
+      formData.signal !== originalData.signal ||
+      formData.nostr_npub !== originalData.nostr_npub
+    );
+  }, [formData, originalData]);
+
+  // Check if form is valid
+  const isValid = useCallback(() => {
+    return Object.keys(errors).length === 0;
+  }, [errors]);
+
+  useEffect(() => {
+    if (!isLoading) {
+      if (!user) {
+        router.push("/login");
+      } else if (!isRegularUser) {
+        router.push("/audit");
+      }
+    }
+  }, [isLoading, user, router, isRegularUser]);
+
+  useEffect(() => {
+    if (user && isRegularUser) {
+      fetchProfile();
+    }
+  }, [user, isRegularUser]);
+
+  // Auto-dismiss toast after 3 seconds
+  useEffect(() => {
+    if (toast) {
+      const timer = setTimeout(() => setToast(null), 3000);
+      return () => clearTimeout(timer);
+    }
+  }, [toast]);
+
+  const fetchProfile = async () => {
+    try {
+      const res = await fetch(`${API_URL}/api/profile`, {
+        credentials: "include",
+      });
+      if (res.ok) {
+        const data: ProfileData = await res.json();
+        const formValues: FormData = {
+          contact_email: data.contact_email || "",
+          telegram: data.telegram || "",
+          signal: data.signal || "",
+          nostr_npub: data.nostr_npub || "",
+        };
+        setFormData(formValues);
+        setOriginalData(formValues);
+      }
+    } catch {
+      // Handle error silently for now
+    } finally {
+      setIsLoadingProfile(false);
+    }
+  };
+
+  const handleInputChange = (field: keyof FormData) => (e: React.ChangeEvent<HTMLInputElement>) => {
+    const value = e.target.value;
+    setFormData((prev) => ({ ...prev, [field]: value }));
+    
+    // Validate on change and clear error if valid
+    const newFormData = { ...formData, [field]: value };
+    const newErrors = validateForm(newFormData);
+    setErrors(newErrors);
+  };
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    
+    // Validate all fields
+    const validationErrors = validateForm(formData);
+    setErrors(validationErrors);
+    
+    if (Object.keys(validationErrors).length > 0) {
+      return;
+    }
+
+    setIsSubmitting(true);
+
+    try {
+      const res = await fetch(`${API_URL}/api/profile`, {
+        method: "PUT",
+        headers: { "Content-Type": "application/json" },
+        credentials: "include",
+        body: JSON.stringify({
+          contact_email: formData.contact_email || null,
+          telegram: formData.telegram || null,
+          signal: formData.signal || null,
+          nostr_npub: formData.nostr_npub || null,
+        }),
+      });
+
+      if (res.ok) {
+        const data: ProfileData = await res.json();
+        const formValues: FormData = {
+          contact_email: data.contact_email || "",
+          telegram: data.telegram || "",
+          signal: data.signal || "",
+          nostr_npub: data.nostr_npub || "",
+        };
+        setFormData(formValues);
+        setOriginalData(formValues);
+        setToast({ message: "Profile saved successfully!", type: "success" });
+      } else if (res.status === 422) {
+        // Handle validation errors from backend
+        const errorData = await res.json();
+        if (errorData.detail?.field_errors) {
+          setErrors(errorData.detail.field_errors);
+        }
+        setToast({ message: "Please fix the errors below", type: "error" });
+      } else {
+        setToast({ message: "Failed to save profile", type: "error" });
+      }
+    } catch {
+      setToast({ message: "Network error. Please try again.", type: "error" });
+    } finally {
+      setIsSubmitting(false);
+    }
+  };
+
+  const handleLogout = async () => {
+    await logout();
+    router.push("/login");
+  };
+
+  if (isLoading || isLoadingProfile) {
+    return (
+      <main style={styles.main}>
+        <div style={styles.loader}>Loading...</div>
+      </main>
+    );
+  }
+
+  if (!user || !isRegularUser) {
+    return null;
+  }
+
+  const canSubmit = hasChanges() && isValid() && !isSubmitting;
+
+  return (
+    <main style={styles.main}>
+      {/* Toast notification */}
+      {toast && (
+        <div
+          style={{
+            ...styles.toast,
+            ...(toast.type === "success" ? styles.toastSuccess : styles.toastError),
+          }}
+        >
+          {toast.message}
+        </div>
+      )}
+
+      <div style={styles.header}>
+        <div style={styles.nav}>
+          <a href="/" style={styles.navLink}>Counter</a>
+          <span style={styles.navDivider}>•</span>
+          <a href="/sum" style={styles.navLink}>Sum</a>
+          <span style={styles.navDivider}>•</span>
+          <span style={styles.navCurrent}>My Profile</span>
+        </div>
+        <div style={styles.userInfo}>
+          <span style={styles.userEmail}>{user.email}</span>
+          <button onClick={handleLogout} style={styles.logoutBtn}>
+            Sign out
+          </button>
+        </div>
+      </div>
+
+      <div style={styles.content}>
+        <div style={styles.profileCard}>
+          <div style={styles.cardHeader}>
+            <h1 style={styles.cardTitle}>My Profile</h1>
+            <p style={styles.cardSubtitle}>Manage your contact information</p>
+          </div>
+
+          <form onSubmit={handleSubmit} style={styles.form}>
+            {/* Login email - read only */}
+            <div style={styles.field}>
+              <label style={styles.label}>
+                Login Email
+                <span style={styles.readOnlyBadge}>Read only</span>
+              </label>
+              <input
+                type="email"
+                value={user.email}
+                style={{ ...styles.input, ...styles.inputReadOnly }}
+                disabled
+              />
+              <span style={styles.hint}>
+                This is your login email and cannot be changed here.
+              </span>
+            </div>
+
+            <div style={styles.divider} />
+
+            <p style={styles.sectionLabel}>Contact Details</p>
+            <p style={styles.sectionHint}>
+              These are for communication purposes only — they won&apos;t affect your login.
+            </p>
+
+            {/* Contact email */}
+            <div style={styles.field}>
+              <label htmlFor="contact_email" style={styles.label}>
+                Contact Email
+              </label>
+              <input
+                id="contact_email"
+                type="email"
+                value={formData.contact_email}
+                onChange={handleInputChange("contact_email")}
+                style={{
+                  ...styles.input,
+                  ...(errors.contact_email ? styles.inputError : {}),
+                }}
+                placeholder="alternate@example.com"
+              />
+              {errors.contact_email && (
+                <span style={styles.errorText}>{errors.contact_email}</span>
+              )}
+            </div>
+
+            {/* Telegram */}
+            <div style={styles.field}>
+              <label htmlFor="telegram" style={styles.label}>
+                Telegram
+              </label>
+              <input
+                id="telegram"
+                type="text"
+                value={formData.telegram}
+                onChange={handleInputChange("telegram")}
+                style={{
+                  ...styles.input,
+                  ...(errors.telegram ? styles.inputError : {}),
+                }}
+                placeholder="@username"
+              />
+              {errors.telegram && (
+                <span style={styles.errorText}>{errors.telegram}</span>
+              )}
+            </div>
+
+            {/* Signal */}
+            <div style={styles.field}>
+              <label htmlFor="signal" style={styles.label}>
+                Signal
+              </label>
+              <input
+                id="signal"
+                type="text"
+                value={formData.signal}
+                onChange={handleInputChange("signal")}
+                style={{
+                  ...styles.input,
+                  ...(errors.signal ? styles.inputError : {}),
+                }}
+                placeholder="username.01"
+              />
+              {errors.signal && (
+                <span style={styles.errorText}>{errors.signal}</span>
+              )}
+            </div>
+
+            {/* Nostr npub */}
+            <div style={styles.field}>
+              <label htmlFor="nostr_npub" style={styles.label}>
+                Nostr (npub)
+              </label>
+              <input
+                id="nostr_npub"
+                type="text"
+                value={formData.nostr_npub}
+                onChange={handleInputChange("nostr_npub")}
+                style={{
+                  ...styles.input,
+                  ...(errors.nostr_npub ? styles.inputError : {}),
+                }}
+                placeholder="npub1..."
+              />
+              {errors.nostr_npub && (
+                <span style={styles.errorText}>{errors.nostr_npub}</span>
+              )}
+            </div>
+
+            <button
+              type="submit"
+              style={{
+                ...styles.button,
+                ...(!canSubmit ? styles.buttonDisabled : {}),
+              }}
+              disabled={!canSubmit}
+            >
+              {isSubmitting ? "Saving..." : "Save Changes"}
+            </button>
+          </form>
+        </div>
+      </div>
+    </main>
+  );
+}
+
+const pageStyles: Record<string, React.CSSProperties> = {
+  profileCard: {
+    background: "rgba(255, 255, 255, 0.03)",
+    backdropFilter: "blur(10px)",
+    border: "1px solid rgba(255, 255, 255, 0.08)",
+    borderRadius: "24px",
+    padding: "2.5rem",
+    width: "100%",
+    maxWidth: "480px",
+    boxShadow: "0 25px 50px -12px rgba(0, 0, 0, 0.5)",
+  },
+  cardHeader: {
+    marginBottom: "2rem",
+  },
+  cardTitle: {
+    fontFamily: "'Instrument Serif', Georgia, serif",
+    fontSize: "2rem",
+    fontWeight: 400,
+    color: "#fff",
+    margin: 0,
+    letterSpacing: "-0.02em",
+  },
+  cardSubtitle: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    color: "rgba(255, 255, 255, 0.5)",
+    marginTop: "0.5rem",
+    fontSize: "0.95rem",
+  },
+  form: {
+    display: "flex",
+    flexDirection: "column",
+    gap: "1.25rem",
+  },
+  field: {
+    display: "flex",
+    flexDirection: "column",
+    gap: "0.5rem",
+  },
+  label: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    color: "rgba(255, 255, 255, 0.7)",
+    fontSize: "0.875rem",
+    fontWeight: 500,
+    display: "flex",
+    alignItems: "center",
+    gap: "0.5rem",
+  },
+  readOnlyBadge: {
+    fontSize: "0.7rem",
+    fontWeight: 500,
+    color: "rgba(255, 255, 255, 0.4)",
+    background: "rgba(255, 255, 255, 0.08)",
+    padding: "0.15rem 0.5rem",
+    borderRadius: "4px",
+    textTransform: "uppercase",
+    letterSpacing: "0.05em",
+  },
+  input: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    padding: "0.875rem 1rem",
+    fontSize: "1rem",
+    background: "rgba(255, 255, 255, 0.05)",
+    border: "1px solid rgba(255, 255, 255, 0.1)",
+    borderRadius: "12px",
+    color: "#fff",
+    outline: "none",
+    transition: "border-color 0.2s, box-shadow 0.2s",
+  },
+  inputReadOnly: {
+    background: "rgba(255, 255, 255, 0.02)",
+    color: "rgba(255, 255, 255, 0.5)",
+    cursor: "not-allowed",
+  },
+  inputError: {
+    borderColor: "rgba(239, 68, 68, 0.5)",
+    boxShadow: "0 0 0 2px rgba(239, 68, 68, 0.1)",
+  },
+  hint: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    fontSize: "0.75rem",
+    color: "rgba(255, 255, 255, 0.4)",
+    fontStyle: "italic",
+  },
+  errorText: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    fontSize: "0.75rem",
+    color: "#fca5a5",
+  },
+  divider: {
+    height: "1px",
+    background: "rgba(255, 255, 255, 0.08)",
+    margin: "0.75rem 0",
+  },
+  sectionLabel: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    fontSize: "0.875rem",
+    fontWeight: 600,
+    color: "rgba(255, 255, 255, 0.8)",
+    margin: 0,
+    textTransform: "uppercase",
+    letterSpacing: "0.05em",
+  },
+  sectionHint: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    fontSize: "0.8rem",
+    color: "rgba(255, 255, 255, 0.4)",
+    margin: 0,
+    marginBottom: "0.5rem",
+  },
+  button: {
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    marginTop: "1rem",
+    padding: "1rem",
+    fontSize: "1rem",
+    fontWeight: 600,
+    background: "linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%)",
+    color: "#fff",
+    border: "none",
+    borderRadius: "12px",
+    cursor: "pointer",
+    transition: "transform 0.2s, box-shadow 0.2s",
+    boxShadow: "0 4px 14px rgba(99, 102, 241, 0.4)",
+  },
+  buttonDisabled: {
+    opacity: 0.5,
+    cursor: "not-allowed",
+    boxShadow: "none",
+  },
+  toast: {
+    position: "fixed",
+    top: "1.5rem",
+    right: "1.5rem",
+    padding: "1rem 1.5rem",
+    borderRadius: "12px",
+    fontFamily: "'DM Sans', system-ui, sans-serif",
+    fontSize: "0.875rem",
+    fontWeight: 500,
+    zIndex: 1000,
+    animation: "slideIn 0.3s ease-out",
+    boxShadow: "0 10px 25px rgba(0, 0, 0, 0.3)",
+  },
+  toastSuccess: {
+    background: "rgba(34, 197, 94, 0.9)",
+    color: "#fff",
+  },
+  toastError: {
+    background: "rgba(239, 68, 68, 0.9)",
+    color: "#fff",
+  },
+};
+
+const styles = { ...sharedStyles, ...pageStyles };
diff --git a/frontend/app/sum/page.tsx b/frontend/app/sum/page.tsx
index d1a39a6..b372ef2 100644
--- a/frontend/app/sum/page.tsx
+++ b/frontend/app/sum/page.tsx
@@ -12,10 +12,11 @@ export default function SumPage() {
   const [result, setResult] = useState<number | null>(null);
   const [showResult, setShowResult] = useState(false);
   const [error, setError] = useState<string | null>(null);
-  const { user, isLoading, logout, hasPermission } = useAuth();
+  const { user, isLoading, logout, hasPermission, hasRole } = useAuth();
   const router = useRouter();
 
   const canUseSum = hasPermission(Permission.USE_SUM);
+  const isRegularUser = hasRole("regular");
 
   useEffect(() => {
     if (!isLoading) {
@@ -82,6 +83,12 @@ export default function SumPage() {
           <a href="/" style={styles.navLink}>Counter</a>
           <span style={styles.navDivider}>•</span>
           <span style={styles.navCurrent}>Sum</span>
+          {isRegularUser && (
+            <>
+              <span style={styles.navDivider}>•</span>
+              <a href="/profile" style={styles.navLink}>My Profile</a>
+            </>
+          )}
         </div>
         <div style={styles.userInfo}>
           <span style={styles.userEmail}>{user.email}</span>
diff --git a/frontend/e2e/profile.spec.ts b/frontend/e2e/profile.spec.ts
new file mode 100644
index 0000000..1f42908
--- /dev/null
+++ b/frontend/e2e/profile.spec.ts
@@ -0,0 +1,345 @@
+import { test, expect, Page } from "@playwright/test";
+
+/**
+ * Profile E2E tests
+ * 
+ * These tests verify that:
+ * 1. Regular users can access and use the profile page
+ * 2. Admin users cannot access the profile page
+ * 3. Profile data persists correctly
+ * 4. Validation works as expected
+ */
+
+const API_URL = process.env.NEXT_PUBLIC_API_URL || "http://localhost:8000";
+
+// Test credentials - must match what's seeded in the database via seed.py
+function getRequiredEnv(name: string): string {
+  const value = process.env[name];
+  if (!value) {
+    throw new Error(`Required environment variable ${name} is not set.`);
+  }
+  return value;
+}
+
+const REGULAR_USER = {
+  email: getRequiredEnv("DEV_USER_EMAIL"),
+  password: getRequiredEnv("DEV_USER_PASSWORD"),
+};
+
+const ADMIN_USER = {
+  email: getRequiredEnv("DEV_ADMIN_EMAIL"),
+  password: getRequiredEnv("DEV_ADMIN_PASSWORD"),
+};
+
+// Valid test npub (32 zero bytes encoded as bech32)
+const VALID_NPUB = "npub1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqzqujme";
+
+// Helper to clear auth cookies
+async function clearAuth(page: Page) {
+  await page.context().clearCookies();
+}
+
+// Helper to login a user
+async function loginUser(page: Page, email: string, password: string) {
+  await page.goto("/login");
+  await page.fill('input[type="email"]', email);
+  await page.fill('input[type="password"]', password);
+  await page.click('button[type="submit"]');
+  await page.waitForURL((url) => !url.pathname.includes("/login"), { timeout: 10000 });
+}
+
+// Helper to clear profile data via API
+async function clearProfileData(page: Page) {
+  const cookies = await page.context().cookies();
+  const authCookie = cookies.find(c => c.name === "auth_token");
+  
+  if (authCookie) {
+    await page.request.put(`${API_URL}/api/profile`, {
+      headers: {
+        Cookie: `auth_token=${authCookie.value}`,
+        "Content-Type": "application/json",
+      },
+      data: {
+        contact_email: null,
+        telegram: null,
+        signal: null,
+        nostr_npub: null,
+      },
+    });
+  }
+}
+
+test.describe("Profile - Regular User Access", () => {
+  test.beforeEach(async ({ page }) => {
+    await clearAuth(page);
+    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
+  });
+
+  test("can navigate to profile page from counter", async ({ page }) => {
+    await page.goto("/");
+    
+    // Should see My Profile link
+    await expect(page.getByText("My Profile")).toBeVisible();
+    
+    // Click to navigate
+    await page.click('a[href="/profile"]');
+    await expect(page).toHaveURL("/profile");
+  });
+
+  test("can navigate to profile page from sum", async ({ page }) => {
+    await page.goto("/sum");
+    
+    // Should see My Profile link
+    await expect(page.getByText("My Profile")).toBeVisible();
+    
+    // Click to navigate
+    await page.click('a[href="/profile"]');
+    await expect(page).toHaveURL("/profile");
+  });
+
+  test("profile page displays correct elements", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Should see page title
+    await expect(page.getByRole("heading", { name: "My Profile" })).toBeVisible();
+    
+    // Should see login email label with read-only badge
+    await expect(page.getByText("Login EmailRead only")).toBeVisible();
+    
+    // Should see contact details section
+    await expect(page.getByText("Contact Details")).toBeVisible();
+    await expect(page.getByText(/communication purposes only/i)).toBeVisible();
+    
+    // Should see all form fields
+    await expect(page.getByLabel("Contact Email")).toBeVisible();
+    await expect(page.getByLabel("Telegram")).toBeVisible();
+    await expect(page.getByLabel("Signal")).toBeVisible();
+    await expect(page.getByLabel("Nostr (npub)")).toBeVisible();
+  });
+
+  test("login email is displayed and read-only", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Login email should show the user's email
+    const loginEmailInput = page.locator('input[type="email"][disabled]');
+    await expect(loginEmailInput).toHaveValue(REGULAR_USER.email);
+    await expect(loginEmailInput).toBeDisabled();
+  });
+
+  test("navigation shows Counter, Sum, and My Profile", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Should see all nav items (Counter and Sum as links)
+    await expect(page.locator('a[href="/"]')).toBeVisible();
+    await expect(page.locator('a[href="/sum"]')).toBeVisible();
+    // My Profile is the page title (h1) since we're on this page
+    await expect(page.getByRole("heading", { name: "My Profile" })).toBeVisible();
+  });
+});
+
+test.describe("Profile - Form Behavior", () => {
+  test.beforeEach(async ({ page }) => {
+    await clearAuth(page);
+    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
+    // Clear any existing profile data
+    await clearProfileData(page);
+  });
+
+  test("new user has empty profile fields", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // All editable fields should be empty
+    await expect(page.getByLabel("Contact Email")).toHaveValue("");
+    await expect(page.getByLabel("Telegram")).toHaveValue("");
+    await expect(page.getByLabel("Signal")).toHaveValue("");
+    await expect(page.getByLabel("Nostr (npub)")).toHaveValue("");
+  });
+
+  test("save button is disabled when no changes", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Save button should be disabled
+    const saveButton = page.getByRole("button", { name: /save changes/i });
+    await expect(saveButton).toBeDisabled();
+  });
+
+  test("save button is enabled after making changes", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Make a change
+    await page.fill("#telegram", "@testhandle");
+    
+    // Save button should be enabled
+    const saveButton = page.getByRole("button", { name: /save changes/i });
+    await expect(saveButton).toBeEnabled();
+  });
+
+  test("can save profile and values persist", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Fill in all fields
+    await page.fill("#contact_email", "contact@test.com");
+    await page.fill("#telegram", "@testuser");
+    await page.fill("#signal", "signal.42");
+    await page.fill("#nostr_npub", VALID_NPUB);
+    
+    // Save
+    await page.click('button:has-text("Save Changes")');
+    
+    // Should see success message
+    await expect(page.getByText(/saved successfully/i)).toBeVisible();
+    
+    // Reload and verify values persist
+    await page.reload();
+    
+    await expect(page.getByLabel("Contact Email")).toHaveValue("contact@test.com");
+    await expect(page.getByLabel("Telegram")).toHaveValue("@testuser");
+    await expect(page.getByLabel("Signal")).toHaveValue("signal.42");
+    await expect(page.getByLabel("Nostr (npub)")).toHaveValue(VALID_NPUB);
+  });
+
+  test("can clear a field and save", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // First set a value
+    await page.fill("#telegram", "@initial");
+    await page.click('button:has-text("Save Changes")');
+    await expect(page.getByText(/saved successfully/i)).toBeVisible();
+    
+    // Wait for toast to disappear
+    await page.waitForTimeout(3500);
+    
+    // Clear the field
+    await page.fill("#telegram", "");
+    await page.click('button:has-text("Save Changes")');
+    await expect(page.getByText(/saved successfully/i)).toBeVisible();
+    
+    // Reload and verify it's cleared
+    await page.reload();
+    await expect(page.getByLabel("Telegram")).toHaveValue("");
+  });
+});
+
+test.describe("Profile - Validation", () => {
+  test.beforeEach(async ({ page }) => {
+    await clearAuth(page);
+    await loginUser(page, REGULAR_USER.email, REGULAR_USER.password);
+    await clearProfileData(page);
+  });
+
+  test("shows error for invalid telegram handle (missing @)", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Enter invalid telegram (no @)
+    await page.fill("#telegram", "noatsign");
+    
+    // Should show error
+    await expect(page.getByText(/must start with @/i)).toBeVisible();
+    
+    // Save button should be disabled
+    const saveButton = page.getByRole("button", { name: /save changes/i });
+    await expect(saveButton).toBeDisabled();
+  });
+
+  test("shows error for invalid npub", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Enter invalid npub
+    await page.fill("#nostr_npub", "invalidnpub");
+    
+    // Should show error
+    await expect(page.getByText(/must start with 'npub1'/i)).toBeVisible();
+    
+    // Save button should be disabled
+    const saveButton = page.getByRole("button", { name: /save changes/i });
+    await expect(saveButton).toBeDisabled();
+  });
+
+  test("can fix validation error and save", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Enter invalid telegram
+    await page.fill("#telegram", "noat");
+    await expect(page.getByText(/must start with @/i)).toBeVisible();
+    
+    // Fix it
+    await page.fill("#telegram", "@validhandle");
+    
+    // Error should disappear
+    await expect(page.getByText(/must start with @/i)).not.toBeVisible();
+    
+    // Should be able to save
+    const saveButton = page.getByRole("button", { name: /save changes/i });
+    await expect(saveButton).toBeEnabled();
+    
+    await page.click('button:has-text("Save Changes")');
+    await expect(page.getByText(/saved successfully/i)).toBeVisible();
+  });
+
+  test("shows error for invalid email format", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Enter invalid email
+    await page.fill("#contact_email", "not-an-email");
+    
+    // Should show error
+    await expect(page.getByText(/valid email/i)).toBeVisible();
+  });
+});
+
+test.describe("Profile - Admin User Access", () => {
+  test.beforeEach(async ({ page }) => {
+    await clearAuth(page);
+    await loginUser(page, ADMIN_USER.email, ADMIN_USER.password);
+  });
+
+  test("admin does not see My Profile link", async ({ page }) => {
+    await page.goto("/audit");
+    
+    // Should be on audit page
+    await expect(page).toHaveURL("/audit");
+    
+    // Should NOT see My Profile link
+    await expect(page.locator('a[href="/profile"]')).toHaveCount(0);
+  });
+
+  test("admin cannot access profile page - redirected to audit", async ({ page }) => {
+    await page.goto("/profile");
+    
+    // Should be redirected to audit
+    await expect(page).toHaveURL("/audit");
+  });
+
+  test("admin API call to profile returns 403", async ({ page, request }) => {
+    const cookies = await page.context().cookies();
+    const authCookie = cookies.find(c => c.name === "auth_token");
+    
+    if (authCookie) {
+      // Try to call profile API directly
+      const response = await request.get(`${API_URL}/api/profile`, {
+        headers: {
+          Cookie: `auth_token=${authCookie.value}`,
+        },
+      });
+      
+      expect(response.status()).toBe(403);
+    }
+  });
+});
+
+test.describe("Profile - Unauthenticated Access", () => {
+  test.beforeEach(async ({ page }) => {
+    await clearAuth(page);
+  });
+
+  test("profile page redirects to login", async ({ page }) => {
+    await page.goto("/profile");
+    await expect(page).toHaveURL("/login");
+  });
+
+  test("profile API requires authentication", async ({ page, request }) => {
+    const response = await request.get(`${API_URL}/api/profile`);
+    expect(response.status()).toBe(401);
+  });
+});
+
diff --git a/frontend/test-results/.last-run.json b/frontend/test-results/.last-run.json
index cbcc1fb..1b3e417 100644
--- a/frontend/test-results/.last-run.json
+++ b/frontend/test-results/.last-run.json
@@ -1,4 +1,6 @@
 {
-  "status": "passed",
-  "failedTests": []
+  "status": "failed",
+  "failedTests": [
+    "d748ac400d08b85935ef-f4350b37502bdc286d29"
+  ]
 }
\ No newline at end of file
diff --git a/frontend/test-results/auth-Session-Persistence-auth-cookie-is-cleared-on-logout/error-context.md b/frontend/test-results/auth-Session-Persistence-auth-cookie-is-cleared-on-logout/error-context.md
new file mode 100644
index 0000000..4710b7a
--- /dev/null
+++ b/frontend/test-results/auth-Session-Persistence-auth-cookie-is-cleared-on-logout/error-context.md
@@ -0,0 +1,32 @@
+# Page snapshot
+
+```yaml
+- generic [ref=e1]:
+  - status [ref=e2]:
+    - generic [ref=e3]:
+      - img [ref=e5]
+      - generic [ref=e7]:
+        - text: Static route
+        - button "Hide static indicator" [ref=e8] [cursor=pointer]:
+          - img [ref=e9]
+  - alert [ref=e12]: ...
+  - main [ref=e13]:
+    - generic [ref=e14]:
+      - generic [ref=e15]:
+        - generic [ref=e16]: Counter
+        - generic [ref=e17]: •
+        - link "Sum" [ref=e18] [cursor=pointer]:
+          - /url: /sum
+        - generic [ref=e19]: •
+        - link "My Profile" [ref=e20] [cursor=pointer]:
+          - /url: /profile
+      - generic [ref=e21]:
+        - generic [ref=e22]: test-1766135485217-ds0t5j@example.com
+        - button "Sign out" [active] [ref=e23] [cursor=pointer]
+    - generic [ref=e25]:
+      - generic [ref=e26]: Current Count
+      - heading "9" [level=1] [ref=e27]
+      - button "+ Increment" [ref=e28] [cursor=pointer]:
+        - generic [ref=e29]: +
+        - text: Increment
+```
\ No newline at end of file