I have a production Flutter app that already connects to an in-house backend. I now need a full upgrade that touches three key areas: the user interface, added functionality, and overall performance. Here is what I’m after: • Rework the current UI so it feels modern and consistent with today’s Flutter design patterns. I will supply the API endpoints and existing widgets; you focus on the visual refresh and smooth animations. • Extend functionality by wiring in social media sign-in/sharing, a reliable payment gateway, and an in-app messaging module. The backend is ready for these endpoints; your job is to handle the client-side integration and state management. • Optimise performance and speed: shorten initial load times, reduce jank during navigation, and make sure memory usage stays low on both Android and iOS builds. Deliverables will be the updated Flutter source, build-ready Android and iOS packages, and a brief hand-off doc describing any new environment variables or setup steps. I will test the release builds against my staging server before final approval. If you know your way around Dart, REST/GraphQL calls, push notifications, and the standard payment and social plugins, this should be right up your alley. Let’s get started!