> relatively friendly tech cultures turn into a more brutal survival of the fittest The problem is that often you have to collaborate a lot in these companies

> relatively friendly tech cultures turn into a more brutal survival of the fittest The problem is that often you have to collaborate a lot in these companies - you need to use services or libraries written by another team, for example. "Fittest" really makes no sense, because almost no one has a PnL sheet broken out by team like wall street. That said, not all companies (Apple, Amazon) had super friendly cultures. If you maintain a core service at amazon, for example, you can expect to constantly have every dependents' roadmap shoved at you all year as it is.