Applied through a 3rd party recruiter. Was sent an OA on Hackerrank. The problem itself was on the level of LC Med-Hard, not terribly difficult in and of itself, however you are under a tight time constraint and unlike LC there is the extra burden of parsing and validating I/O, which in any real-world program occupies only a tiny fraction the code, but here occupied an inordinate amount of time implementing. Wasted too much time messing with this and not the actual algorithm, which was relatively straightforward, and could not complete it in time. It is obvious that these sorts of places prize speed over all else, and filter for competitive programmer types vs actual working SWEs.