Business Tablet Operating System Design

I run an existing business and am in need of a customizable operating system for our company tablets. Key requirements would include: - Customizable UI: We want to make our operating system as personal and reflective of our brand as possible. Therefore, suitable experience with designing and creating adjustable UIs is required. The UI doesn't need to support theme adjustments, however, it should be future-proofed so that support can be added in later. Ideally, previous experience in creating an OS UI for business use would be advantageous. - Multi-tasking capabilities: Efficiency is key for our operations, and therefore, the operating system should be coded to support multi-tasking. Proficiency in creating OS which can handle running multiple operations simultaneously will be beneficial. Notably, while not expressly stated, I expect the system to have basic security protocols in place, safeguarding us from potential cyber threats. Therefore, knowledge of advanced security protocols, even if not directly applied to this OS, will stand you in good stead. A good freelancer for this project would have a substantial programming background, with a specialty in creating customized operating systems. Knowledge in developing systems for commercial use would be a plus.