I completed a HackerRank-style test as a pre-assignment. I forget which platform it was.

The interview itself included one LeetCode easy question and then Amazon leadership principles questions.

The coding question involved finding a number that appears only once in an array where all other numbers appear twice. It was pretty easy, but answering the follow-up question about doing it efficiently isn't obvious if you don't have a lot of practice with bitwise operation problems.

I did well on the coding part but fumbled the leadership questions. I recommend focusing on those, as the coding puzzle was a simple one.

Tell me about a situation where you had to learn something new.