Apple Software Engineer interview questions

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. Meaning that if you don't get through an interview with one team, you have to start all over for another team. Onsite you go through a few different interviews, each one had 2 interviewers who mostly asked white boarding questions. I found 2 interviewers in many sessions over about 6 hours exhausting. It's hard to judge what interviewers want when there are two of them staring you down while you write a solution to their question.