I need a Flutter-built mobile app that functions as a lightweight productivity tool centred on calendar integration. The core requirement is seamless two-way sync with Google Calendar so users can view, create, edit, and delete events from inside the app and have those changes instantly reflected in their Google account. Key points you should know • Flutter is mandatory so the same codebase ships to both iOS and Android. • Google Calendar API integration must handle authentication (OAuth 2.0), event CRUD operations, recurring events, and time-zone accuracy. • The interface should feel native, with a clean schedule view, day/week/month toggles, and quick-add functionality. • Please build with scalability in mind: state management through Provider, Riverpod, or Bloc is acceptable—let me know your preference. • Deliverables: complete Dart source code, a brief setup/compile guide, and one test build per platform for review before final hand-over. If you have prior experience linking Flutter apps to Google Calendar, that will fast-track the project. Let’s discuss your proposed workflow and timeline.