Amazon Software Development Engineer interview questions

Reached me through online application. Requested me to do an online assessment

Started with online technical interview, fairly basic stuff like finding cycles in linked lists, reversing a string, etc. Then they brought me out for an in-person interview. This was much more difficult, first two interviewers both asked tree related questions which I was prepared for. Then the third was all about object orientation. The fourth and final interviewer was more of a grab bag of random questions. Surprisingly, only the first interviewer asked me about my previous projects. The fourth interviewer and I chatted briefly about them as he was escorting me out of the building.