Round 1: I was asked to implement transaction record pagination. The problem was straightforward.
Round 2: I was asked a commonly asked question which is simialr to Leetcode 981. I pretended to see the question for the first time and implemented the solution. The interviewer was friendly, and we had a good discussion.
Round 3: I was asked to design a news feed system.
Round 4: I was asked behavioral questions related to projects on my resume. The interviewer asked so many questions that I ran out of things to say.