It's friendly with the developer and allows him to code in a modern IDE online - increasing the chances he can prove his actual skills. Neat display of coding progress, not just the final result. As a developer, I code on CodinGame as a hobby.

The timer is a positive pressure to assess the person's stress management and organization before the test. In addition, a tutorial part allows the user to prepare for the exercise, so no unpleasant surprises. The exercises and questions have various levels and allow the person who analyzes them before chaining them to choose an order to minimize the loss of points. Very good job

I liked the overall look, it's pretty user friendly and they associate some of your test with visual result (like robot taking crates)