Had a couple of chats over phone and Skype. Then, I got a take home challenge. It's nothing out of the ordinary, though there is some ambiguity you need to take care of. I didn't continue in the process and they gave me awesome feedback of why it was so. However, some things could be improved. As feedback to Teralytics: work on giving positive feedback (all I got was non-constructive, seemingly forced, "he knows Scala") and balance it with negative (this was way better). On both types of feedback, strive to give examples - without them, some of the points will be vague. Overall it was very pleasant and all the people involved treated me very well.

I had an interview with an engineer, another one with a manager, followed by a take-home technical challenge relevant to the kind of problems faced at Teralytics and another challenge had at their own office, working with them for one day, presenting and explaining my solution at the end. Challenging, fun, sets quite a high bar for people (both on a technical and human level).