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Leetcode: - 2 medium, 1 hard - Backtracking, dynamic programming, hash map. 3rd round interview: - Systems design - Discussed elements involved - Read vs. write heavy systems - Choosing a database.

The interview process is well-organized and conveyed professionally. Be ready to be surprised by questions. Do your homework. For software engineers, try to dig a bit into how they do things at Facebook. They will ask very specific questions.

The interview was a tough one. The number of rounds depends on the college you graduated or did postgraduate studies from. It could be 6 rounds, or it can even be as long as 12 whole rounds. It is going to be a long day for the interviewer as well as