Amazon's interview process was very structured and done in 4 phases (at least for the Technical Project Manager position). The first three were over the phone and was spread over several weeks starting with the recruiter. It was a brief pre-screening call asking a few details about my experience and responsibilities. The second phone interview was with the manager for position. The first part was more personal in nature with the second half much more technical. Third interview was with another manager. The conversation was much more relaxed and felt more like a gauging for fit but was also technical. Fourth and final interview was a full day, in-person session with multiple panels of 1 or 2 people, each with a set of pre-determined questions related to their Leadership Principles. Questions were read and they'd record your responses.