Vivek is a CS grad from India who worked at Amazon in the Kindle team as a developer. After a year, he quit Amazon to start Interviewstreet which was originally a platform to conduct mock interviews. The business model didn't work and soon it evolved into a platform to help companies screen programmers.
Interviewstreet is the first completely Indian based company to be selected by Y-combinator.
Currently, the business has evolved and he heads HackerRank.com