At FB in engineering, you generally don't get placed on a team, you choose which team you join, only after 6 weeks of "Bootcamp" where you ramp up on the techni

At FB in engineering, you generally don't get placed on a team, you choose which team you join, only after 6 weeks of "Bootcamp" where you ramp up on the technical and cultural environment. That said, you're right that even with that, people can end up joining teams which are a poor fit, so internal mobility (switching teams) is definitely valuable here too.