Amazon Software Development Engineer interview questions

I was approached by a recruiter who then sent my resume over to the Hiring dept. They were prompt and scheduled the interview within a week. There were 4 technical rounds and 1 with HR. All the interviewees were personable and friendly. A lot of the questions involved coding. They walked me through many of the problems and asked questions as I was coding. They wanted to understand my thought process. If I strayed or did something wrong, they'd ask questions to indicate it. Fairly standard questions on algorithms. Definitely prepare for graph, tree algorithms, data structures and be prepared to justify a choice for a data structure. The interviewers didn't particularly care about syntax, but they want to see that you are comfortable putting pen to paper. Also be prepared with atleast 5-6 questions you want to ask them. I ran out of these and it became awkward towards the end!