After a few phone calls, you go to an onsite interview at the Apple campus. Apple interviews engineers for the specific team you'd be working with. This means that if you don't get through an interview with one team, you have to start all over for another.

Onsite, you go through a few different interviews. Each one had two interviewers who mostly asked whiteboarding questions. I found having two interviewers in many sessions over about six hours exhausting. It's hard to judge what interviewers want when they're both staring you down while you write a solution to their question.

They ask a lot of OS X and iOS memory management questions.