My initial contact with Rackspace was over email where we set up a time for technical pre-screening interview. The time of the interview arrived but the recruiter called me later than she said she would. I was very impressed with the systematized interview questions, arranged into beginner, intermediate and advanced. If I didn't know the answer, the interviewer gave me the answer (which I thought was really considerate as that's a common post-interview questions "what was the answer to that question?"). At the end, she told me I had done better than expected. An interview with the hiring manager was arranged but ultimately fell through when I told them I wanted to work remotely.

First call is with recruiter then they schedule the technical screening. Once you pass that you go onsite for a panel. Mine was 4 panels and range between 2-3 people asking questions. Had to whiteboard some code and other were team fit questions.