Everybody has been very professional and accommodating. I met a lot of smart people and enjoyed discussing my and their experience. The interview consists of multiple 1-hour sessions, during each you get a mix of coding/design and behavioral questions. The most important are the coding/design questions. It matters less if you solve them, but how you approach them and how you communicate your thought process. Typically you get 3-4 interviewers, and at the end you will meet with someone senior who is closing the whole interview process. That last person will typically not be on your initial interview schedule.