I had a couple phone interviews and an extensive on sight interview. I was turned down a couple times, then after gaining more experience I was able to get my foot further in the door. The majority of questions throughout the phone interviews as well as on-sight were directed at my own projects, emphasizing that I was actually responsible for solving the problems that I claimed. They definitely ask more probing questions than any other interviews I've been on. The phone interviews were relatively brief, less than a half an hour, but fairly technical. The on-site was about 6 hours and definitely had some high intensity portions. A tour is followed by a 20 minute presentation about a problem you have solved, then followed by 6-8 one on one interviews. The facilities are extremely impressive so it's easy to get psyched-out, but overall the employees I met were all friendly and respectful. You can always get a year or two more experience and try again with more focused effort so it helped me not to build things up. The recruiter I had was very helpful, definitely gives the impression that he was there to make things go as well as possible. Overall I'm glad I had to put in a lot of work to make the job a reality.