Expense Tracker App

I need a skilled Flutter developer to create an expense tracker app with the following features:

- User login: Authentication method to be decided (email/password, social media, or biometric).
- Category-based filtering: Categories to be determined (e.g., food, travel, utilities).
- Data visualization: Graphs to show spending trends (type of graph to be decided).
- Offline mode: Access and log expenses without an internet connection.

Ideal skills and experience:
- Proficiency in Flutter and Dart
- Experience with user authentication and data visualization
- Ability to implement offline functionality
- Strong UI/UX design skills

Please share your portfolio and relevant experience.