Modern Vibrant MVP App Development

I'm looking for an experienced developer to create a Minimum Viable Product (MVP) app for both iOS and Android platforms. The app should include the following core features:

- User registration/login
- In-app purchases
- Push notifications

The user interface should be modern and vibrant.

Ideal skills and experience include:
- Proven track record in MVP app development
- Expertise in both iOS and Android platforms
- Strong UI/UX design skills with a focus on modern, vibrant aesthetics
- Experience integrating in-app purchase systems
- Knowledge of push notification services
-BLE communication from mobile app

Please provide examples of previous work and relevant experience. Looking forward to your bids!