Following a phone interview I was invited to the Redmond campus for a long day of one-on-one interviews. Microsoft was gracious enough to pay all of my expenses for flying out to WA and eating/traveling. The 1:1 interviews themselves were interesting and difficult but often oddly focused: I felt as if the engineers who asked me questions usually were only interested in their own areas of study, and my knowledge or lack thereof in their (sometimes very different) fields didn't matter as much. For example, I had one interviewer ask me at the beginning of the interview if I had studied design patterns. I answered that while I had used some simple ones in the past, I have never formally studied them and thus don't know that many, nor the names of the ones I do know. Despite this, he continued to ask me questions for an hour about design patterns, and became visibly angry with me when I couldn't put names to the patterns he described. This probably boils down to typical engineer unsocial tendencies. The strangest part of the process is that you interview for a group within Microsoft that is chosen for you ahead of time without any of your own input. I ended up interviewing for a group that was doing work that did not interest me whatsoever, which made the process that much harder.