The interview process involved several phone interviews, followed by an on-site interview.

The on-site portion was very packed, with 8 or 9 interviews, each with two interviewers.

The initial questions were relatively easy, focusing on instruction sets, and included some rather straightforward test questions.

Questions at lunch were more challenging, covering debug information and data structures.

Another interview that followed was harder, asking about reverse-post order and requiring very detailed coding.

The atmosphere was okay, but compared to other companies, it felt a little arrogant (e.g., "you forgot a semicolon there").

The biggest turn-off was when an interview was cut short. A manager came and stated they needed someone with LLVM experience, even though this was never mentioned on my resume. He also knew from the phone interviews that I had no LLVM experience.

I later heard this is typical Apple behavior. Therefore, be careful and don't waste your time. Ask at the phone interview what exactly they want.

LLVM debug information: what it looks like, data structures, etc.