It started with a 3 hour project. Basically they send you an email at a certain time with the problem they want you to solve, then you have 3 hours to email back your code. I don't want to give the exact project, but go into it knowing how to develop a bookmarklet and also know a little about regular expressions.
After that, there was a 30 minute live coding problem with a developer over Skype/JSFiddle. You have to be reasonably sure that your code is going to work before you hit "Run", so you're not able to debug as you go along. And no Google. Once your code fails, you're allowed to debug. It was a really weird way of doing it, personally I'm of the opinion that you should be able to interview in the way that you're going to work. It tested basic vanilla JS concepts (functions, syntax, and navigating the DOM) and I solved it with recursion.
Two days later I got a standard form rejection notice (that was actually worded pretty poorly, it was more about patting themselves on the back because their work is so hard that they can afford to be really picky). Not sure what happened, I was proud of my code throughout the entire process. The next step would have been a non-technical interview I believe, and I think after that they make a hiring decision.
