Android App UI Redesign & Bug Fix

I'm looking for a talented Android developer who can revamp the UI of my app and address some key bugs. The project involves:
- Changing the app's font style to a specific family that I'll provide.
- Altering the button layout to make them larger, rounded, and with different colors.
- Rectifying specific actions which currently cause the app to crash.

Ideal candidates should have:
- Proficiency in Android UI/UX design principles.
- Strong experience in fixing app crashes.
- A keen eye for detail to ensure the new UI aligns with my brand's identity.