Technical recruitment and code challenge platform HackerRank has raised $9.2 million in series B investment from existing investor Khosla Ventures and new investor Battery Ventures. Angel investors like Motorola Mobility VP (Engineering), Peeyush Ranjan, former Facebook VP – Engineering and Products, Greg Badros and Facebook product management director, Dan Rubinstein also participated in this round.

With this investment, HackerRank has raised a total investment of $12.4 million until now. This includes a $3 million investment from Khosla Ventures as InterviewStreet in September 2011 and a $200,000 seed investment for being part of the Y Combinator’s Summer 2011 batch.

HackerRank started off as Interviewstreet in December 2010, offering technical recruitment solutions to companies. It later launched a social platform for coding challenges called HackerRank.com in October 2012. Last December, the company renamed its technical recruitment solution as HackerRankX and merged both products together under the HackerRank name.

HackerRank claims to offer hundreds of computer science challenges across various computer science domains like Artificial Intelligence, Machine learning, algorithms and functional programming abstractions, to allow programmers to improve their skills. The platform claims to have community of 500,000 programmers across 40 countries, with over 50,000 new additions every month.

As for its technical recruitment platform, HackerRank claims that over 1,000 companies have used its recruitment platform to hire programmers. This includes companies like Facebook, Amazon, Microsoft, Evernote, Yahoo, VMware, Square, Walmart, Adobe, Accenture and Citrix among others.

Other players in this space include AngelPrime and GSF-backed HackerEarth and Codelity. Outside India, HackerRank competes with companies like TopCoder and CodeChef.