The Problem
The Challenge
Authentication is one of the most common pain points in Flutter development — handling auth state across app restarts, managing loading states during sign-in, and cleanly separating auth logic from UI. Built this as a production-ready template that any client project can drop in directly.
Key Insight
"A clean AuthStateListener pattern meant the app routes users correctly on cold start, sign-in, and sign-out — zero race conditions."
How We Solved It
Strategy & Execution
Implemented a complete auth system: Email/Password sign up + login, Google Sign-In (one tap), password reset via email, user profile creation in Firestore on first sign-in, profile photo upload to Firebase Storage, and account deletion. Auth state handled via StreamProvider — the app listens to Firebase auth state changes and routes automatically.
01
Structured the project with a clean separation: auth_service.dart (Firebase logic), auth_provider.dart (state management), and auth screens (UI only).
02
Implemented StreamProvider wrapping FirebaseAuth.instance.authStateChanges() — the app automatically navigates between auth and home screens.
03
Built Google Sign-In with the google_sign_in package — handled first-time vs returning user scenarios in the callback.
04
Added profile photo upload with image picker, image compression before upload, and download URL stored in Firestore user document.
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