(I work at Hackerrank) > an online judge necessarily imposes more rigid constraints because of the automated verification The platform is evolving to not be a

(I work at Hackerrank) > an online judge necessarily imposes more rigid constraints because of the automated verification The platform is evolving to not be as rigid anymore as well. For example, we have a product (in a closed beta) which assess candidates on complete projects (eg: build a nodejs app that defines this api and behavior), and testing and scoring is based on unit test cases. This way, you are testing for more real-world usecases, and also allowing the flexibility beyond straight IO.