Mobile App Enhancement and Feature Addition

I'm seeking an experienced mobile app developer with expertise in both iOS and Android platforms. The project involves modifying an existing source code to improve an app and add new features.

Key Responsibilities:
- Modify and improve the current source code
- Add new features to the mobile app
- Enhance the user interface for better user experience

Ideal Skills and Experience:
- Proficiency in mobile app development for both iOS and Android
- Prior experience in improving mobile apps
- Strong UI/UX skills
- Experience in feature addition on mobile apps