Flutter Ride-Hailing App Debug and Update

Fix bugs in existing flutter ride hailing app(firebase) play store update. I have existing Flutter ride hailing app that is already live on Google play store. The original developer is not in the right frame on mind. Because of time, i need an experienced Flutter+Firebase developer to fix specific issues and prepare an updated build.

Important: The app is already publish on play store, This is bug fixing +update NOT a new app, Source code and Firebase access will be provided.

Issues to fix;

pickup address shows coordinates/codes instead of real address- implement proper reverse geocoding.
passenger does not see when a driver accepts a ride-fix real time ride status update

Driver and Passenger chat is not working- fix firebase chat messaging & listeners
General bug fixes and testing.

Deliverables
All listed issues fixed, Tested APK/AAB, Update build uploaded to existing play store listing, Code remains clean and maintainable.
REQUIREMENTS
Proven Flutter = Firebase experience
Experience updating existing play store apps
Must not change app package name
Must not regenerate keystore
Clear communication.