Amazon

The first question in the technical interview section was simple. As I solved it, they added more and more layers of complexity. I got it correct, but maybe my solution was suboptimal because I did not make it to the next interview round.

Online OA, then 3, 1-hour long technical and behavioral interviews. First 2 interviews went great, but the 3rd interviewer was uninterested, uncaring, disrespectful, and lacked knowledge of basic functions, having me explain very basic things to him

The technical portion wasn't all bad. They were both medium LeetCode problems at best. Don't slack on preparing for the behavioral. Always prepare multiple work scenarios. If you are entry-level, don't be afraid to include academic or non-technical