Native Mobile App Development

I'm looking for a skilled mobile/web full-stack developer to build a native mobile app for both iOS and Android platforms. The app should feature:

- User login and registration
- Push notifications
- In-app purchases
- Payment gateway integration
- Backend setup for bookings

The design should be simple and minimalistic.

Ideal skills and experience:
- Proficiency in mobile app development for iOS and Android
- Experience with user authentication and push notification services
- Knowledge of integrating payment gateways
- Strong backend development skills, preferably with experience in booking systems
- Ability to create clean, minimalistic designs

Please provide examples of similar work done.