We are looking for an experienced solo Flutter developer (no agencies) to build a high-quality mobile application for both iOS and Android. The app will include user authentication, a clean and responsive UI, API integration, real-time data handling, in-app purchases, subscriptions, and notifications. The goal is to deliver a fast, scalable, and production-ready app with a smooth user experience. Scope of Work: Develop mobile app using Flutter Implement authentication (email / social login) Integrate REST APIs Build responsive UI for multiple screen sizes Implement in-app purchases and subscription system Implement push notifications Handle state management and app performance Testing and bug fixing before delivery Requirements: Individual freelancer only (no agencies or teams) Strong Dart knowledge Solid Flutter framework experience (widgets, layouts, navigation) State management (Provider, Riverpod, Bloc) REST API integration (HTTP, Dio) Firebase (Auth, Firestore, Notifications) Experience with in-app purchases and subscriptions Experience with push notifications implementation Responsive UI / cross-platform design Performance optimization Debugging & testing Git version control App deployment (Google Play & App Store) Deliverables: Full Flutter source code APK / IPA builds Documentation (setup + deployment) Timeline: 2–4 weeks Budget: Fixed or hourly (to be discussed) To Apply (Required): Include the answer to this question at the top of your proposal: “Explain how you would implement in-app subscriptions in Flutter (tools/libraries + backend validation approach).”