hackattic - No nonsense, real world programming challenges

Workday - Workday is an on‑demand financial management and human capital management software solution.

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

Paylocity - Paylocity has revolutionized the industry and has quickly become the leading independent provider of online payroll services and HR solutions.

Takehome - Effective and humane coding challenges for candidates

Paycom - Paycom is a Human Capital Management system that helps companies manage the complete employment life cycle, from recruitment to retirement.