Every company is different, but my preference is to break into teams by domain/network boundary. In this case sharing libraries is extremely rare. Teams could e

Every company is different, but my preference is to break into teams by domain/network boundary. In this case sharing libraries is extremely rare. Teams could easily be on different tech stacks. Edit: my experience is mostly between seed - series B startups. If you're Google, then of course you're going to have a ton of internal libraries. But I'd put it in the same category as open source.