[user32489318]

I assume he built his system and then onboarded the company as a client to it. Possible issue here is the degree of separation. If he ever worked on the system before he resigned, or re-used some concepts of it, then I’m sure company would sue him and take the system for free.

I’ve considered doing similar for one corp I’ve once worked with. The corp used an obscure hybrid cloud solution, unfortunately, the cloud provider didn’t really understand the corps needs (governance,devex,monitoring) making it impossible to do anything basic without manual action from an administrator. Pretty solvable with a couple of APIs and a few dashboards