Antpool - bitcoin mining pool
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
HireLoop - HireLoop exists to make hiring more efficient through automation and streamlined communication.
iMocha - Make intelligent talent decisions.
Greenhouse - Greenhouse Software makes companies great at hiring.
Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.