I was contacted via email to set up a couple of initial phone interviews. I had two phone interviews back-to-back. The first one was a bit brutal as I wasn't too prepared for it. Besides the usual discussion about items on my resume, it mainly consisted of knowledge-based questions about various things in C and C++ (inline functions, preprocessor, etc.), memory allocation, networking layers, sets and unions, and bottom-up vs top-down design. I was then hit with a couple fairly simple problem solving questions. The second interview was roughly the same, however, it started with a simple programming problem and then moved onto questions about synchronization. I came out of the two phone interviews not feeling too great but got an email for a final round phone interview roughly two weeks later. The final round phone interview was a lot more lax. At this point, it seemed like they were more interested in placing me in the correct division than testing my knowledge and programming skills. My interviewer asked me some basic questions about data structures and that was it. From there, we discussed what kind of projects I like to work on and other "placement" type questions. The final round interview ended on a very positive note and two weeks later, I received a call from HR with an offer for a summer internship.

Very quick and easy. Was interviewed while attending one of their conferences for college students a few years back. Had one in-person interview solving a coding problem on whiteboard and another phone interview with a different engineer on background and generic conceptual questions.