Amazon Software Developer interview questions

I had two phone interviews at amazon the passed both and waiting for the third one. The first interview was so short. it took about 20 minutes the interviewer asked general data structures question and questions related to web development. The second interview was long and took about an hour. the interviewer asked about data structures as well and some data base and memory related questions/

Applied online, and received an email the very next day asking to setup a phone interview. An interview was scheduled for a week later. Interviewer was very nice and called on time. It was all technical.