Javascript coding exams, did fibonacci with dynamic programming variations. We ended up with some frontend devops discussions as well. I asked to speak with VP of Eng and they let me spend time asking about the org.

Found out about Knewton through career fair and applied directly through recruiter. Friendly people, pretty smooth interview. Had an initial challenge handed to me, a coding challenge made to take around 4 hours. After that, was offered a phone interview. The final step (I presume) was a 3-4 hours Skype session with back to back interviews with 4 employees. Three technical interviews, one culture fit.