Odds are this is a dev shop with more than one person doing at least some things. It would explain how “he” was able to get so many jobs and maintain appearances. And a lot of startups don’t have the best screening processes to begin with (have a beer with a founder, check out their source code, you’re hired!). This is exactly the place where the structure and processes of larger companies can be a benefit. And even then, people work multiple jobs and get away with it. It’s become popular post COVID.

Given these two factors, I don’t think it would be out of the realm of possibility for something like this to happen.