Extreme Tech Challenge | 6,640 followers on LinkedIn. The world's largest startup competition for entrepreneurs addressing global challenges | Extreme Tech Challenge (XTC) is the world's largest startup competition and ecosystem for showcasing the most innovative tech founders addressing the UN SDGs. Founded by legendary Silicon Valley venture capitalists, Young Sohn and Bill Tai, our mission is to empower entrepreneurs building innovative technologies that improve the world. The goal is to identify potential market-leading companies that can impact the world in a big way and provide the rocket fuel to help them scale faster.