Started with the 1st of two phone interviews. The 1st phone interview was about 40 minutes. Pretty standard questions about your resume and situations/tasks you've had in your prior positions. About two days later I received a call from the recruiter who set up the 1st interview. The recruiter was very disorganized. She actually thought she was calling me for the first time and I had to remind her that we spoke a couple times before and that it was her that set up my 1st phone interview. The 2nd interview was an extension of the 1st phone interview. "Explain your answers thoroughly. STAR approach to answering the questions will help you". A week or so went by without any word back from Amazon and then I received an e-mail from the recruiter who I'd been in communication (poor) with throughout the process. After replying to the e-mail and not receiving a confirmation, I finally received a confirmation for the "face-to-face" interview(s). The "face-to-face" interview lasted almost 5 hours. I was rotated from one interviewer to the next. Each last about 45 minutes. The questioning was very similar to the phone interviews, but they will throw at you an interviewer who is NOT from the team for the position that you're interviewing for...known as the "Bar Raiser". You may have heard of various differing past stories about the Bar Raiser. My experience with the B.R. was a pleasant one. Once again, understand the STAR technique to answering questions and you should be fine. The interviewer's are a little quirky, socially delayed (they were most likely the last ones picked on the play ground for teams), and they just stare at you at the completion to answering their questions. Don’t be thrown off your game, be confident in your answers, don’t doubt yourself…it’s them not you. As for the work environment, it was VERY casual...looked like the employees just "rolled out of bed and went to work in their PJ's" : )