Cross-Platform App MVP Development

I'm seeking an experienced app developer to create an initial Minimum Viable Product (MVP) for a cross-platform application on both iOS and Android. The app must feature user authentication and adopt a bright and colorful design.

Key Requirements:
- Develop for both iOS and Android platforms
- Implement user authentication
- Design a bright and colorful user interface

Ideal Skills and Experience:
- Proven experience in cross-platform app development
- Strong knowledge of user authentication protocols
- Expertise in creating vibrant and engaging app designs
- Proficiency in relevant programming languages and frameworks

Looking forward to your proposals!