This is my first job at a FAANG company, so I'm interested in what are the main mindset shifts needed to succeed when switching into massive environment like this for the first time.
Focus a lot more on communication -- there are going to be literally dozens of people in your team, XFN, and partners (this could already be more than your previous company). Finding out who needs to hear about your project, and delivering the relevant updates to them in the right medium, is the thing that most new FAANG engineers struggle with.
See this session I have about communication and how to think about the different mechanisms.