The interview process begins with several 30 mins technical phone interviews first (No HR phone screen for my case), the phone interviews are just basic technical background review and simply text-book questions. Hours later, they invited me to do an on-site interview in Cupertino. It is much harder than I expected. The on-site interview consisted of 15 people 1:1, each of them has 30mins, from 10am-6pm non-stop with a lunch interview in 12. Each interviewer has different backgrounds so their questions could be very hard at some time. Just in my point of view, 1. Don't wing it. If you don't know just say no. You can imagine like 15 guys ask you question from every sides of technical background, you would probably need 3 phd to answer them all correctly. So just be honest and they will really appreciate that. I missed a lot of questions, and some of them I have totally no idea of, all I did is tell them I don't know and show the potential to learn. 2. Pay attention to detail. That's very important. Be well prepared for your presentation and materials if they interested. Try your best to show them how much you focused on details. Get yourself some extra copies of those printed materials and bind them neatly. 3. It is all about communications. The communication in an on-site interview is even important than technical part. They want to know who you really are and whether you are good to deal with in the future if they really want you. So when you past the 1st round interview already, be smart and ALWAYS show your good altitude. Keep smile at all time. I got the unofficial offer hours later. The interview process overall is positive and all the interviewers are very nice. They shown their enthusiasm about their job during the interview. Hope this helps and good luck.

Introduced myself and research in the beginning and got asked bunch of technical questions with simple coding problem at the end. The manager explained about the team before the interview ended