Experienced Mobile App Developer for Comprehensive Bug Fixing and Performance Optimization

We are seeking an experienced mobile app developer to address critical bugs, enhance stability, and optimize the performance of our existing mobile application, available on both Android and iOS platforms. The app is currently live or under testing and requires significant improvements before its next release. The project involves resolving a range of issues, from critical crashes to minor UI inconsistencies, and implementing performance enhancements. The technology stack will be confirmed, but candidates should be proficient with Flutter, React Native, or native Android/iOS development. The backend utilizes either Firebase or a custom API. Source code is available on GitHub or GitLab. Detailed Bug Issues to Fix: Critical Bugs: - App crashes on startup (specifically Android 12 & above). - Login fails intermittently. - Users frequently receive timeout errors. - User session is not saved properly. - App freezes on dashboard load, particularly on slow networks. - Push notifications are not received on iOS devices. - App crashes when attempting to upload images. Major Bugs: - UI layout breaks on various smaller screen sizes. - Data does not refresh consistently after updates. - Logout functionality does not clear the session properly. - Duplicate API calls are causing slow performance. - Payment status is not updating in real time. Minor Bugs / Improvements: - Incorrect error messages are displayed to users. - Loading indicators are missing in some screens, leading to poor user experience. - Text overflow and alignment issues are present throughout the application. - The keyboard hides input fields on certain screens. - Dark mode UI exhibits inconsistencies. Performance & Optimization Issues: - Address high memory usage. - Improve slow screen navigation. - Optimize overall app size. - Reduce unnecessary API calls. - Significantly improve app startup time.