Android Delivery App Development

I'm looking for an experienced Android developer to create a delivery app. The app should cater to either food, package, or grocery delivery.

The app must include these key features:
- Real-time tracking
- In-app payments
- User reviews and ratings

Ideal Skills and Experience:
- Proven experience in Android app development
- Strong knowledge of integrating real-time tracking and payment systems
- Experience with user review and rating systems
- Familiarity with UI/UX design principles for a seamless user experience

Please provide a portfolio showcasing similar projects.