Build Android E-commerce Flutter App

I need an experienced developer to build a comprehensive Android Agri e-commerce application using Flutter. The app should have the following key features:

I already designed the UI and other backend features using bolt.ai now I am facing few issues in completing the various users journey. I need support to build this web app with below features for example
- Seamless integration with a secure payment gateway.
- Robust user account management system
- Advanced product search and filtering capabilities
- Additional essential e-commerce functionalities.

Please include the following in your proposals:
- Details of your experience with Flutter and e-commerce app development.
- Any relevant portfolio work, especially Flutter-based projects.
- Your hourly rates within the specified budget range.

Looking forward to your creative solutions!