I applied online. The process took 2 months.

The overall flow was easy, first a recruiter contacts you through phone call, it is generally from US/UK and make sure that you pick that phone call on time. The recruiter will tell you about the timings for the next set of interviews that are being scheduled.

First round of interview: 2 interviewers, a 15 min discussion on my past experience and hackathon wins (amazon rarely discusses this in initial round but yes, they were interested in knowing about the microservices based architecture in which I had worked earlier). Got 2 easy questions for that interview.

2nd round, again 2 interviewers, got asked 3 problems, 1 was of trees, medium difficulty traversal problem, needed to do some pruning to optimize my solution. The other two were dp questions, basically they were followups of each other, basic dp problem again, rated medium at LeetCode.

Verdict: Got better compensation at a different company, so opted for that over Amazon.

Tree traversal DP Prefix sum problems Difference array problems

Heaps are an important thing, as around 50% of problems that Amazon asks use this for optimization.