It was an interesting format: go to a coder-pad type of environment where you can pair program, and he copy/pasted a question. The interview would build upon itself: implement function A, then function B... etc, all the while asking certain CS fundamentals questions (e.g. space/time complexity). My one complaint was that, while a class was defined for you, and my task was to implement certain methods, it wasn't very clear to me what was actually available to me (i.e. the methods, inputs) vs there, on screen, but I couldn't really use. I probably spent too much time trying to understand this hypothetical scenario. I didn't pass, but I liked the format. Much better than the typical academic data structures and algorithms LeetCode style questions because it seemed more practical. On the other hand, so questions tend to be more clear (i.e. here's your input, I expect this output, here are your test cases).