Senior Flutter Developer – Convert Production Web App

We have a fully built and deployed web application using:
Firebase Auth
Cloud Firestore
Cloud Functions
Stripe
Firebase Hosting
The backend logic is complete and in production.
We are NOT rebuilding backend logic.
We need a senior Flutter engineer to:
• Rebuild the frontend in Flutter (iOS + Android)
• Connect to existing Firebase backend
• Follow a detailed technical specification
• Work in structured milestones with code review checkpoints
This is a frontend-only conversion project.
Important
Backend logic must not be modified.
All grading algorithms and business logic are implemented in Cloud Functions.
Flutter app must call existing callable functions.
Firestore schema is fixed.
You will receive full technical documentation and GitHub access.
Tech Stack
Backend (Do Not Modify):
Firebase Auth
Firestore
Cloud Functions (Callable)
Stripe
RevenueCat
Flutter Requirements:
Flutter 3.x (latest stable)<...