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Three rounds, each 45 minutes. I did not even have time to have lunch. The first round was about system design. The second round was half system design, half coding. The third round was a coding question, which was really hard.

1. Got first 1:1 interview on campus. It was a pure algorithm test. Design a data structure to store a sparse 2D matrix containing only 0s and 1s, then write a function to add two such matrices. I first proposed using an array to remember each 1's l

The interview process started with a phone screen. This was followed by a full-day, on-site interview. During the on-site interview, there were detailed questions about my experience. The full day involved interviews with various members of the te