Flutter and Flutter Flow developer

The application is already live and operational; however, several issues and enhancements need to be addressed: Stripe subscription purchases are not properly syncing with user accounts after successful payment. Subscription status occasionally remains active after cancellation. Failed payment and grace-period handling are not fully implemented. Stripe webhook events require validation and improved error handling. Firebase Authentication occasionally logs users out unexpectedly after app updates. Apple Sign-In flow requires review and testing on physical iOS devices. Firestore queries need optimization to reduce read costs and improve performance. Push notifications are not consistently received when the application is in the background or terminated state. Deep linking implementation is incomplete and requires testing across Android and iOS. Some API responses are not properly cached, causing unnecessary network requests. Token refresh and session management require improvements. Offline mode does not properly sync user data when connectivity is restored. Hive local storage implementation requires restructuring and migration support. Certain screens experience performance drops when rendering large datasets. Memory leaks have been reported after prolonged app usage. Real-time chat occasionally fails to update messages without reopening the screen. Media uploads can fail on slow network connections and require retry mechanisms. Image caching is inconsistent across some devices. Video playback requires optimization for lower-end devices. Google Maps markers and location updates occasionally lag on Android devices. Calendar scheduling functionality requires timezone validation. Search and filtering performance needs optimization. Android 14 compatibility issues have been reported with background services. iOS latest version testing revealed notification permission handling inconsistencies. Build flavors (Development, Staging, Production) require cleanup and standardization. CI/CD pipeline requires review for automated deployment reliability. Existing GetX architecture requires refactoring to improve maintainability. Several legacy modules require migration to the current application architecture. Application startup time is slower than expected and requires optimization. Crash reports from Firebase Crashlytics need investigation and resolution. Security review is required for API communication, token storage, and user data handling. App Store and Play Store release processes require verification before the next production release.