Hiring a ChorusOS developer comes with several advantages. Firstly, these developers are experts in real-time operating systems, which are critical in various industries such as telecommunications, automobile, and aerospace. Their skills can help create systems that respond quickly and reliably to external stimuli, ensuring smooth operations.

Secondly, ChorusOS developers are proficient in microkernel design, which promotes modularity and compartmentalization. This makes the system more secure and easier to manage and update, as changes in one module do not affect the entire system.

Thirdly, these developers understand distributed computing, which is vital in today's interconnected world. They can design systems that effectively use network resources, thus improving efficiency and reducing costs.

Fourthly, ChorusOS developers are adept at hot upgradeability. This means they can update systems without shutting them down, ensuring continuous service.

Lastly, their knowledge of the ChorusOS environment, with its specific APIs and tools, makes them invaluable when working on projects that require this operating system. They can navigate the system efficiently, troubleshoot issues, and provide solutions quickly.

In a nutshell, hiring a ChorusOS developer brings expertise in real-time systems, microkernel design, distributed computing, hot upgradeability, and specific ChorusOS knowledge, all of which lead to efficient, reliable, and cost-effective systems.