Activity and Fragment Navigation Fix

I'm seeking an experienced Android developer to resolve some navigation issues and state preservation problems in my app.

Key Requirements:
- Fix navigation issues between activities and fragments
- Ensure proper state preservation during fragment replacement
- Improve lifecycle management to prevent UI inconsistencies

Ideal Skills & Experience:
- Strong knowledge of Android architecture components
- Experience with Fragment and Activity lifecycle
- Proven track record in state preservation and navigation handling
- Familiarity with debugging and optimizing Android applications

Please provide examples of similar work done.