The onsite consisted of 5 coding problems, 2 architecture/design discussions, and 1 behavioral interview. I got 3 of the 5 coding questions right (with optimal runtime & space complexity), but that was not enough. Based on this, I'd say that prior work experience isn't really a factor. I built apps from scratch that have scaled to millions of active users, something that none of my interviewers have done on their own. But, that doesn't help you get an offer if you don't get all of the algorithms correctly. They're looking to hire a specific profile--CS major, spent 40+ hours to prepare. This interview should be relatively easy for people like that, but very difficult for pretty much everybody else. I even asked one of the interviewers when was the last time he had to solve a problem similar to this, and he said never (haha).