For the launch of this year’s Next Billion Dollar Startup list, we wanted to go back to the companies that successfully climbed to the ranks of unicorn and ask their leaders: what have you learned.

Luis von Ahn is CEO and cofounder of Duolingo, the world’s most popular language learning app, and a 2019 alum of the Next Billion Dollar Startup list. The mobile app crossed the $1 billion dollar mark In December of 2019 after a funding round from CapitalG. Von Ahn spoke with us about the challenges he and his team have faced along the way, as well as advice for younger entrepreneurs.

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Duolingo Founder: What I’ve Learned Since Our Billion Dollar Valuation | Forbes