Android Doctor Booking App Development -- 2

I need an experienced mobile app developer to create a comprehensive doctor booking application for Android.

Core functionalities should include:
- Appointment scheduling
- Doctor profiles
- Patient profiles

The app must seamlessly integrate with third-party services:
- Electronic Health Records (EHR)
- Payment gateways
- Telemedicine platforms

Ideal candidates will have:
- Proven experience in developing Android apps
- Familiarity with EHR systems and payment gateway integration
- Knowledge of telemedicine platforms

Please provide a portfolio demonstrating relevant work.