Medical Clinic Scheduling App

I need an experienced mobile app developer to create an application for both iOS and Android platforms for a medical clinic. The app should have:

- Appointment Scheduling: Patients can book, reschedule, or cancel appointments.
- Patient Follow-Up Reminders: Automated reminders for patients post-appointment.
- User Authentication: Secure login with email and password

Ideal skills and experience:
- Proven experience in developing mobile apps for both iOS and Android.
- Strong knowledge in implementing secure user authentication systems.
- Familiarity with appointment scheduling and reminder functionalities.
- Ability to create a user-friendly and intuitive interface.

Please provide examples of similar projects you've completed and your estimated timeline.