I don't remember the OA well. It was a medium-difficulty greedy problem about airplane seats.
The first-round interviewer had been at the company for less than three years. She spent a long time introducing herself, and then asked me if I had any questions.
She asked two BQs: one about a deadline, and one about whether I had ever had to onboard new people or act as a mentor.
There was no screen sharing in this round. She said the later rounds would share the screen, and that this one was mainly about communication.
The first question was the standard LeetCode LRU. I only briefly talked through my approach and didn't write any code.
The second question was system design: design an instant messaging app that shows when a message has been received, when it is still sending, and when it has been read.
Now I'm waiting for the next round. The next round is five interviews in a row in one day.
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