First, I had a phone screen with the hiring manager for the role/team I was interviewing for, which lasted 45 minutes. There were some questions about my experience and resume, and also some questions based on Amazon Leadership Principles. I then heard back about 2-3 business days after that I would be proceeding to the "loop." The loop was the most difficult part, because it required a lot of preparation. I had five, one hour interviews, and two thirty minute breaks. Each interviewer asked 2-4 questions based on the Amazon Leadership Principles, and questions about my background and technical skills. 10-15 mins were left per each interview round to ask questions about Amazon, the person's role, etc. I heard back within the five business day guarantee with an offer.