Cross-Platform Patient Registration App

I'm looking for a developer to create a basic registration app for both iOS and Android platforms. The app will be used to collect patient registration data.

Key Requirements:
- Support for both iOS and Android
- Registration via Email, Social Media, or Phone Number
- Collection of Personal Details (name, age, address), Medical History, and Prescription Information

Ideal Skills:
- Experience in mobile app development for both iOS and Android
- Familiarity with secure data handling and privacy regulations
- Prior experience with registration forms and user authentication

Please provide examples of previous similar work and an estimated timeline.