Simple Cross-Platform App Development

I need a developer to create a simple, cross-platform app (iOS and Android).

Essential features are:
- User login/registration via email and password
- Main screen to display information, with text and buttons
- Contact form or simple messaging feature

Ideal skills and experience:
- Proficiency in mobile app development for both iOS and Android
- Experience with user authentication and clean UI/UX design
- Ability to deliver a functional, user-friendly app

Please provide:
- A brief description of your experience
- Estimated delivery time

Thank you!