Amazon Software Development Engineer interview questions

First took online challenge and then invited to on-site interview. It took 2 weeks. On the interview day, I had 4 interviews with 4 different teams. Most interviewers knew what they were doing. They helped through the process. However, one of them could not manage the time, left little time for question. The other was new at interviewing and getting directions from the other one, which was confusing. An interview starts with cv questions that take 10-15 mins.

After applying online, I was asked to submit a solution for a challenge problem sent to my email, afterwards there was 3 screening phone calls, then I went to an onsite interview (3 technical interviews, 2 HR). During the interviews I was asked about programming languages, networking, threading, troubleshooting production systems, data structures and programming puzzles.