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A word on cover letters: they aren’t required (and may or may not be considered), so it’s your call on whether to include one. If you do decide to include a cover letter, many of the same suggestions we have for building a good resume apply here as

It was hard and hectic. It was not embarrassing, but I felt like it was. The process was simple, not too different from other companies. I didn't prepare much, but it would have been hard even if I had studied.

Tough! The process involved one screening round followed by three coding rounds: * Two DSA-focused rounds * One ML-focused round I performed well in the ML round, but surprisingly, the feedback was negative, and I did not receive an offer.