Not many people start multi-billion dollar businesses, and you can count on two hands the number of people who achieve that goal before they’re 30. Henrique Dubugras, 27, CEO of payments platform Brex, and his cofounder Pedro Franceschi, 26, are two of them. The pair came to the U.S from Brazil in 2016—after founding and selling fintech company Pagar.me in Brazil—to attend Stanford University, before dropping out after less than a year to start the company.