I must say I was impressed. The process was extensive but Amazon wants the best of the best. It was as described; phone interview which included a math flow question and 3 behavioral questions. It was a 45 minute process. My interview was late in the evening. I was emailed by the recruiter about the next steps the very next day. They scheduled the (hopefully) final interview in a different city. It started with a tour of the fulfillment center, then there was a math flow question, for which we were given 15 minutes. This was followed by 4 different interviews; it is random and you might not answer the math flow question to start with. Don't get scared by the math question, take a deep breath and read it once or twice. I did that and was able to correctly answer it in less than 7 minutes. The person that talked about the math flow question with me was the one that talked to me about the case study. Then I was walked to a senior operations manager for a second interview. My 3rd interview was with HR, and then my final one was with the site leader. They pretty much ask about 3-4 behavioral questions which could all be the same. I had a great experience. Don't get me wrong, the interview was pretty difficult, but Amazon team was very very professional. I know not everyone has the same experience, but mine was wonderful. Make sure that you read up on their interview method and the 14 leadership values.