When David Cramer (@zeeg) first built Sentry (@getsentry) he wasn’t trying to start a company. He just wanted to share a tool he’d hacked together for other developers. But soon thousands of companies, including Uber and Airbnb, were using it via open source. That’s when he realized he’d hit product-market fit — by accident. “My version of product-market fit is when customers emotionally, viscerally react in a positive way,” he says. “If they just say, ‘Oh, that seems useful,’ something’s wrong. It’s not clicking.” On The Review, Cramer shares his unconventional journey from high school dropout to building a $3B company, including: -How an open-source hobby found product-market fit -Why giving away your product for free can be a weapon for growth -Why he raised money only after bootstrapping to $600K ARR -How founders can think about marketing, and why the company should reflect their personality Read more about Sentry’s path to product-market fit: lnkd.in/eJdN7Giv

Nov 4, 2025 · 5:16 PM UTC

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Incredible read. I like how this highlights a core truth that product-market fit happens when users sell your product for you.
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