HackerRank is a technical skills platform that helps companies screen, interview, and hire developers based on what they can actually build rather than what their resume claims. Founded in 2009 by Vivek Ravisankar and Hari Karunanidhi, the company runs a two-sided model: a community where millions of developers practice coding challenges, and an enterprise product that lets 3,000+ companies - including a large share of the Fortune 100 - assess candidates with real-world coding tests, live pair-programming interviews, and, increasingly, AI-assisted evaluation and proctoring.
Karat is a Seattle-based company that runs technical interviews on behalf of employers through its 'Interviewing Cloud' - a global network of trained Interview Engineers who conduct 24/7 live, structured technical interviews backed by enterprise infrastructure and hiring analytics. Used by enterprises like Roblox, American Express, Intuit, Pinterest and Wayfair, Karat lets engineering teams scale hiring capacity, reclaim engineer time, and make fairer, more consistent hiring decisions.