Complete Fitness iOS App with Backend

I need a make an existing fitness application appstore ready. I already have the iOS version and backend built. I need someone to setup the backend on my domain, fix any issues or dependencies and make it production ready

Core feature set
– A workout-routine library where users can browse, start, pause, and resume guided sessions.
– Persistent progress tracking so personal stats, streaks, and achievements update in real time across launches.

Integrations
The build must allow users to share completed workouts or milestones straight to their preferred social channels and accept in-app purchases or subscriptions through a secure, PCI-compliant payment gateway and save workouts to backend.

Key expectations
• Pixel-perfect UI parity with the reference app, adapted for the latest iPhone and iPad sizes.
• Robust architecture (MVVM, Combine or similar) with unit tests covering critical logic.
• Clean, human-readable code with clear comments.
• Delivery via TestFlight plus full Xcode project so I can inspect, run, and extend the code locally.

Please base your timeline on building a production-ready clone, including QA and any App Store compliance tweaks.