Android App Modification Needed

I'm looking for someone to modify an Android app.

Requirements:
- Add new features.
- Improve design/UI.

Ideal Skills and Experience:
- Android app development expertise.
- Experience in adding features like user authentication, push notifications, and in-app purchases.
- Strong UI/UX design skills to enhance navigation flow, color schemes, and icons/buttons.
- Ability to change posting links and update names as per requirements.

Please ensure no time-wasters and only experienced developers apply.