Flutter App Enhancement

I need to advance my existing Flutter mobile application. The key areas to focus on are:

Performance Optimization:
- Primary issue: Slow loading times.

UI/UX Enhancements:
- Navigation and menu design improvements.
- Visual design and layout refinements.

Ideal Skills and Experience:
- Proven expertise in Flutter development.
- Strong background in performance optimization.
- Experience in UI/UX design, particularly in navigation and visual layout.
- Ability to identify and resolve loading time issues effectively.

Looking for a developer who can deliver a smoother, more user-friendly app experience. Please provide examples of similar work done.