Experienced Mobile Developer Needed to Resolve Login Issues in Existing Flutter App

We are seeking a skilled mobile developer to diagnose and fix critical login and sign-up issues within our existing Flutter application. The app is currently functional, but users are encountering problems with the authentication process, including unresponsiveness and error messages during sign-in.

The application's backend utilizes Firebase Authentication for both login and sign-up functionalities. While the primary technology is Flutter, candidates with strong React Native experience who can adapt to the project's structure are also encouraged to apply.

Key Tasks:
- Debug and resolve all identified login and sign-up issues using email and password.
- Ensure Google login functionality is working correctly and seamlessly integrated.
- Implement and verify proper session persistence, ensuring users remain logged in after closing and reopening the app.
- Review and update any outdated dependencies to improve stability and security.

Requirements:
- Proven experience with Flutter development (or strong React Native skills with ability to work with Flutter).
- Familiarity with Firebase Authentication or other API-based authentication methods.
- Excellent debugging and problem-solving abilities.
- Capacity to deliver a high-quality solution quickly, ideally within 1-2 business days.

Deliverables:
- A fully functional and tested login system for both Android and iOS platforms.
- A concise summary detailing the fixes implemented.
- Updated project files with all necessary code changes.