As for HackerRank itself, Ravisankar tells me it has close to half a million programmers in its database and its coding contests have become quite popular (mostly thanks to word-of-mouth marketing).

In total, the company currently has about 1,500 customers and close to 6 million developers on its platform that use the service to practice their coding skills (which is what HackerRank started ...

HackerRank has released a new mobile app that lets developers solve a coding challenge to apply for a job, with the guarantee of a response from prospective employers within five days.