Amazon Software Development Engineer interview questions

Thought the position for AWS is HPC related position (MPI or so). But all questions are basic software engineering. First round coding test 1h. Failed in second round.

After two phone interviews that involved coding exercises on a collaborative coding tool, I was invited for a day long onsite interview. There were six sessions of back to back interviews, with a short break for lunch. The interviews themselves focused on my interest in the organization, my technical interests, depth and breadth, my design and coding skills, and my professional culture and ethics. The interview environment was very relaxed, even at points when I struggled with coding issues the interviewer was encouraging and obviously interested minimizing the inevitable pressures of interview.