I was sent an Online Assessment email in the day of application. They had a list of helpful links on how to prepare for the assignment, including a full demo of the process and the coding environment which behaved exactly like the real HackerRank environment. The OA had 2 LeetCode style questions, both had a very long description and took some time to process. Besides that, the questions themselves were quite difficult, the first one was easier than the second one but it was also difficult. Didn't do good enough so I was rejected a few hours after completing the OA.

Firs round its technical assessment 1 easy question and the next its medium Data structure question usually LinkedList operations. second round was virtual also sae format but unfortunately I did not use the interviewer for clues (I think they want you to engage with them). also behavioural questions on the culture of Amazon come prepared with stories to tell for each behavioural concept