I interviewed via my college's campus recruiting. I had an on-campus interview which consisted of an easy programming question. A few days later, they offered to fly me out to WA for interviews. On site interviews took an entire day. I was asked to do some white board coding, some O(n) questions, and some basic CS questions. In general, knowledge of algorithms and data structures was useful. Since this was for a test position, any code I wrote was followed up by "and how would you test that?" Providing test cases in an organized, well thought out manner was all that took. Overall, a pretty typical software engineering interviewing experience. Easier than both Google and Facebook in terms of question difficulty. Recruiting department was much more organized than other tech companies.