Flutter App & Full Backend

I need my completed designs turned into a production-ready Flutter application that runs smoothly on iOS, Android, and Web from a single codebase. Alongside the front-end work, the project also requires a solid backend that covers three pillars: database management, secure user authentication, and well-documented API endpoints that the app can consume.

You will translate the existing UI mock-ups into responsive Flutter widgets, wire them to real data, and ensure consistent behavior across all three platforms. On the server side, I expect a clean architecture with role-based auth, efficient data models, and clear REST (or GraphQL, if you prefer) routes. Feel free to recommend the tech stack—Firebase, Node.js, Django, or another approach—so long as it meets the requirements for scalability, reliability, and straightforward DevOps hand-off.

Deliverables:
• Complete Flutter source code with build instructions for iOS, Android, and Web
• Backend source, documentation, and deployment guide
• Tested API endpoints with sample requests/responses
• Database schema + migration scripts
• Brief handover session or walkthrough video explaining configuration and deployment

Code should be clean, commented, and version-controlled. Automated tests covering critical paths are expected before final sign-off.