App modifications and sdk modifications

I am looking for a skilled developer to help me with modifications for my app. I need functionality enhancements to improve the user experience and make the app more efficient.

Specific requirements:
- Modify existing functionality in the app's source code
- Use a specific SDK for the modifications

Ideal skills and experience:
- Strong understanding of app development and experience with making functionality enhancements
- Proficiency in working with source code and making modifications
- Familiarity with the specific SDK required for the project