Amazon Software Development Engineer interview questions

I initially contacted Amazon through the career fair at my university; I gave them my resume at that time. Shortly after that, they contacted me to schedule an initial technical interview with a software development manager. The first interview was difficult, but I apparently answered the questions well enough to be invited back for three more technical interviews with Amazon software engineers. I went through a total of four in-person 1-on-1 technical interviews, each lasting approximately 45 minutes. After I completed those interviews, a recruiter notified me within a few days to notify me that Amazon would be offering me a job, and a different recruiter contacted me a couple of days after that to give me the specifics of the offer. My advice: the interview questions will be difficult, but be confident, explain your thought process well, and retain your composure even if you think the interview is going badly. You might be doing better than the interviewer is letting on.