[nbm]

At FB, most ICs are not hired for a specific team in advance, and instead choose between (for SWE, a long list of) teams during the Bootcamp process. You can chat to future team mates (not just manager or lead) and ask them straight out about that. (Some people also ask for the half-ly survey results for that team as well.)

If you’re being hired for a team specifically (at another company, say), ask for a “follow-up” meeting with future team mates after offer as a condition for accept. You have a lot of power at that point.