Custom Phone OS Development

I'm looking for a skilled developer to create custom phone software for a new device. The software should function similarly to iOS, with a primary focus on communication.

Key requirements:
- User-friendly interface
- Robust security and privacy features
- App store integration

Ideal Skills and Experience:
- Proven experience in developing mobile operating systems
- Strong background in UI/UX design
- Expertise in security protocols and app store frameworks
- Ability to ensure compatibility with both smartphones and tablets

Please provide a portfolio showcasing similar work.