Hi,
I'm Kishan, a full-stack web developer. Please have a look at my profile and reviews to know more about me.
I've built multi-threaded API servers using Node.js before and I have also made something similar to your proxy requirements, but using VPNs instead of proxies. With my previous experience and knowledge of Node.js, Unix/Linux networking and APIs, I should be able to handle this project with ease.
Please let me know your thoughts.
Regards
Kishan