Had to do three phone calls. The first was to talk a little bit about yourself. The second and third where technical questions that related you personal experience with the amazonian principles.

The interview was about 8 hours long with questions primarily about their principles at Amazon. An HR rep will call you before to give you tips on what to do at the interview. If you follow that and have charisma during the interview that will be enough. They look for hard workers and those who want to learn since the job environment is intense.