Medication Delivery App Development

I am seeking an experienced mobile app developer to create a medication delivery application for both Android and iOS platforms. The app will connect customers, pharmacies, and delivery personnel in my city.

Essential functionality to include:
- Order tracking
- In-app payment
- Push notifications

User groups:
- Customers: Order medications
- Pharmacies: Receive and manage orders
- Delivery personnel: Track and deliver orders

Authentication should be via phone number verification.

Ideal skills and experience:
- Proven experience in mobile app development (Android & iOS)
- Strong background in building secure in-app payment systems
- Familiarity with real-time order tracking and push notification integration
- Experience with user authentication methods, particularly phone number verification
- Ability to design user-friendly interfaces for multiple user groups

Please provide a portfolio of similar work. Looking forward to your bids!