CodeSignal - CodeSignal is the leading assessment platform for technical hiring.

coderpad - Collaborative code editor with in-browser, real-time execution. Conduct programming phone screens like a boss.

Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.

CodeInterview.io - CodeInterview is a live coding interview tool for developers.

HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.

HackerEarth - HackerEarth is the network of top developers across the world. They connect to start-ups, tech companies, organizations and discover the best developer jobs. They participate in programming challenges and compete against other top developers.