Cross-Platform App Modification -- 2

I need a zip file modified for a mobile app. The app must be developed cross-platform using Flutter. The zip file may need the following changes:

- Modify existing features
- Add new features
- Fix bugs

Ideal Skills and Experience:
- Proficiency in Flutter
- Experience in modifying and debugging existing code
- Strong background in mobile app development, especially cross-platform
- Ability to implement new features as per requirements
- Good problem-solving skills

Please provide examples of previous Flutter projects.