I could have sworn I already read this, turns out the date on the article isn't correct, I think this was written in June '15:
https://news.ycombinator.com/item?id=9766816
Which makes sense given that I tried out their online quiz this summer after reading this exact post.
EDIT: Here's a link to when it was posted to LinkedIn, June 23rd, 2015:
https://www.linkedin.com/pulse/three-hundred-programming-int...