Amazon Software Development Engineer interview questions

One phone screen, 45 minutes long. Then a day later gave me a offer to fly to Seattle for a onsite interview. They paid for flight, travel, and food for the interview process. Felt very intimidated at first when I started the interviews. Each interviewer was very easy to talk to and I quickly became comfortable. Total of 5 interviews each 45 minutes long. The next day I received an offer from amazon.

First phone interview was 45 minutes. We went slightly over time as my interviewer called late. I was asked questions about my work experience and data structures questions (solutions involved hash tables and trees). I was scheduled for a 2nd interview one week later. The second interview was more impersonal (no questions about my resume) and I struggled to finish the question he presented within the 45 minutes. My interviewer was kind and said I had done well. I followed up a week later, and finally heard after two weeks that I hadn't been selected to interview further.