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.