Apple Hardware Engineer interview questions

Lots of general questions of systems engineering. Questions spanned from analog electronics, optical engineering, sensing technology, image sensors, characterization. People who interviewed me seemed very prepared in their field, but were from a variety of specialties. Overall they were fair and nice, but I had the impression that they were looking for somebody who is expert/specialist on everything.

Two phone interviews and then got call for onsite. Onsite interview was grueling. Back to back 8 interviews, 45 minutes each. Surprisingly, no behavioral questions. Overall, I was not happy with the process and how HR treats candidates. Didn't accept the offer.