There were two initial phone screens, one highly technical and one fairly high level talk about my experience. The technical phone screen involved a lot of difficult questions around threading/concurrency and database transaction/isolation levels/etc. A few weeks later, I was invited in for a pretty intense half day interview with a few different groups of people. Each session was highly technical. I was given some logic problems. They didn't necessarily expect an answer, but just wanted to "see how I think". I was also asked multiple times to write code on the board while people watched. These problems involved writing SQL or Java.