Saw them at university recruiting, got a call from them a couple months later. Phone screen, dev test project, then on-site interview. There were 3 panel-style interview rounds with a mix of technical and behavioral. I thought the questions were generally easy, no real algorithm coding questions or anything. Not quite as technical as a lot of other companies. I thought I killed the interviews overall since I was able to answer most of their questions, but I assume I didn't get the offer due to not being a great 'culture fit'. It seems that people that at Rackspace have part of their identity tied into the company and very strictly abide by some core values. I wasn't terribly intersted in working for the company, so I didn't really do my research on the companies values / current products / etc. I think that's what got me, they care a lot about the non-technical parts, from what it seems.