Android App UI/UX Redesign & Feature Addition

I'm in need of a skilled Android developer who can make some changes to my existing app.

Key Tasks:
- UI/UX Redesign: I need the color scheme and theme of my app to be revamped. It's important for me to offer a visually appealing and user-friendly interface to my users.
- Feature Addition: I also require new features to be integrated into the app.

The ideal candidate should have:
- Proven experience in UI/UX redesign for Android apps.
- Proficiency in adding new features to existing apps.
- Strong understanding of Android design principles.
- Prior experience with successful app launches on Google Play Store.