Received an email saying Dropbox saw my resume at a Hackathon and was interested in pursuing candidacy. I was sent a coding challenge to do online (I generally value NDAs, so I can't say, but it's for sure a question that was already posted to this site in other interview reviews), took an hour and a half and was more of a "build-from-scratch" kind of thing rather than a tough algorithms puzzle. I got 18/18 on it, and was emailed two days later to set up a phone interview. Phone interview, was asked a variation of the counting change problem, I wasn't quite able to code it up. Got the denial a few days later, as expected. Everyone was very nice and friendly, had a great chat with the interviewer also. I'd recommend giving this company a shot, there was NOT kool-aid at all like at most companies; just genuine engineers who seemed to want to hire great talent.