Flutter Dev for Database & Authentication

I need a skilled Flutter developer to implement user authentication and integrate a Firebase database into my existing app. The design is already complete, I just need the database to be fully operational.

Required skills and experience:
- Proven Flutter development experience
- Strong understanding of Firebase
- Previous experience with user authentication

Your task will include:
- Integrating Firebase for data management
- Implementing a user authentication system

Please share your work samples where you have performed similar tasks. Looking forward to your bids!