The $9B startup that wants to create a billion new developers

Replit is the leading no-code app builder for consumers and enterprise, letting anyone with an idea build real, deployed software using natural language. The company just raised a $400 million Series D at a $9 billion valuation. In this episode of Founder Firesides, co-founder and CEO Amjad Masad sat down with YC's Nicolas Dessaigne to talk about Replit's 10-year journey from browser IDE to vibe coding platform, why the people getting the most value aren't traditional developers but entrepreneurs and domain experts closest to the problem, and what Agent 4 unlocks with parallel agents, built-in design, and the ability to run your entire company on Replit. 0:28 – Anyone Can Build Software 2:14 – The Rise of AI-Native Builders 4:52 – Not Just Developers Anymore 7:18 – What People Are Actually Building 10:36 – How Replit Is Spreading Everywhere 14:02 – What You Can Build (and What You Can’t) 19:22 – YC, Growth, and Early Lessons 23:18 – From Vibe Coding to Autonomous Agents 29:44 – The Future: Everyone Becomes a Builder 36:12 – What Skills Matter Now Apply to Y Combinator: https://www.ycombinator.com/apply Work at a startup: https://www.ycombinator.com/jobs