Amazon Software Development Engineer interview questions

5 rounds, including 4 technical interviews and 1 project review at lunch. Each round takes about 45 mins. The technical questions asked were not easy for me. The one at lunch time was a manager asking me about some personality questions and my past projects. There was 1 interviewer called bar raiser that came from another team. Usually bar raiser is the most experienced one, and he has the deterministic vote to the decision.

Two 45 minuet phone screenings back to back with different engineers. The first interviewer was a bit sharp, and straight to the point. After saying hello he just asked if I was ready and sent me a link to a collabedit so that I could code. He had a thick accent, and was somewhat hard to understand, really seemed like he didn't want to be there. Second interviewer was much more pleasant, asked a few questions regarding discrete mathematics before going into a coding problem on collabedit as well. Once finished he asked for an explanation of the time complexity and if I had any questions.