Amazon Software Development Engineer I (SDE I) interview questions

OA with two coding problems and then was contacted a couple months later about a final 3 round interview. OA was two medium problems and 3 round interview consisted of behavioral and technical questions

1 question about heaps, 1 generic design a parking structure. The next round was an API design. The behavioral round was quite straightforward, one question that caught me out of the blue was "Name a tool that you learnt on the job".