Multi-Platform OS Development

I'm seeking experienced developers to create a comprehensive operating system that supports Windows, Linux, and macOS across desktop, mobile, and embedded platforms.

Requirements: script & running tests
- Development of a robust and secure OS.
- Support for all three platforms: Windows, Linux, macOS.
- Compatibility across desktop, mobile, and embedded systems.

Ideal Skills:
- Expertise in OS development.
- Experience with cross-platform software.
- Strong understanding of security protocols.
- Ability to write detailed project proposals.

Please provide detailed project proposals outlining your approach, timeline, and any relevant past work or experience.