Apple Software Engineer interview questions

I was reached out by a Software Engineer on the team at first and did a first phone interview. Then, I met with a hiring manager and director of engineering during a conference. Next, an onsite interview with 4 people. The feedbacks were all positive. However, I was switched to the second manager's team and she wanted more interviews. Eventually, it turned out that I was switched to the third sub-team with a new recruiter. All the three sub-teams belong to the same department. So, I did one more phone interview with a Software Engineer and another onsite interviews with 6 people. It was a long process, but all people I met were friendly, nice and smart.