Phone screening using and online development platform. On site interview. They don't really focuses on the knowledge of the candidate. I if you are good are typing and handle its online development platform you can get a job here. I think they try to be too clever for their own good. Just one interviewer focus on the knowledge didn't care if the program run on their tool that was the most enjoyable part of the interview. The other exercises just focus if you were able to type fast and find the syntax in google. If you want to nail your interview I recommend practice at least a day doing programs in this development platform find out how you can add on it libraries like jquery. Don't bother on refreshing on security or basic javascript conscepts they don't care.