Several phone interviews, then on-site interview. On-site is very packed, 8 or 9 interviews with 2 people each. Relatively easy questions about instruction sets, some rather easy test questions. Questions at lunch were harder (about debug information and data structures). Another interview then was harder, about reverse-post order and very detailed coding questions. Atmosphere is ok, but compared to other companies a little bit arrogant (e.g. "you forgot a semicolon there"). Biggest turn off was that interview got cut short, manager came and said they need somebody with LLVM experience, even though this was never in my resume, and he knew from the phone interviews that I've never worked at LLVM. I heard later this is typical Apple behavior, so be careful and don't waste your time and ask at the phone what exactly they want.