I read all the comments before I got in the process and assumed it wouldn't happen to me. It will happen to you. 15 minutes interview, the NDA, the case study that takes days to prepare (you will sacrifice at the very least your week-end). Took them months to get back to me, and then weeks of mails back and forth to plan the interview with the manager. Funny enough it only took 48h to send me an automatic rejection email. No feedback wathsoever. Carefull how you treat your potential talents, a bad impression like this can spread far and wide