Two 25-year-old IIT Kharagpur graduates, Varun Vummadi and Esha Manideep, turned down dream offers to build Giga AI, a startup teaching machines to talk like humans. Backed by Redpoint Ventures, Y Combinator, and Nexus Venture Partners, Giga’s $61 million Series A is redefining how voice, emotion, and intelligence merge in the future of customer care.