I need a production-ready Android app built in Flutter. The two pillars of the first release are: • Secure user authentication – email/password to start, with room for social login later. • Full Google Play Billing integration for both one-off purchases and subscriptions. You will work in Dart with null-safety, follow Flutter best practices, and keep the codebase clean and well-documented. State-management is your call—Provider, Riverpod, Bloc—so long as the structure stays maintainable. I’ll supply finalized UI designs and any backend endpoints or Firebase credentials you need. Deliverables • Complete Flutter project that compiles for Android. • Auth flow wired to my backend/Firebase. • In-app purchase flow tested in Google Play’s sandbox. • README plus a short hand-off call so I can run builds myself. Please share at least one live Flutter app that already uses authentication or in-app purchases. I’m ready to start as soon as I find the right fit.