Founder stories
Open-source error monitoring platform that helps developers track, triage, and resolve production errors in real-time.
How David acquired customers
Tools used to build Sentry
David Cramer started Sentry as django-db-log in 2008. Five years of open source work led to product-market fit from day one when they launched the cloud service.
Sentry's origin isn't glamorous. In 2008, someone asked on IRC how to record errors to a dashboard. I gave them example code, created a repository, and django-db-log was born.
Over the years, I open sourced dozens of Django projects. At Disqus (joined 2010), we relied heavily on django-db-log. When I accidentally took down the entire platform my first week, the tool couldn't handle the error volume. That real-world use drove practical improvements.
Around Christmas 2012, Chris Jennings and I used our vacation to turn this into a business. We built multi-organization support, added Stripe billing, and launched on Heroku. Total time: about two weeks.
We launched and had our first paying customer that same day. Seven dollars. But here's the thing - we had product-market fit from day one because we'd spent half a decade building what developers actually needed.
The best thing you can do is find customers who share the same desired outcome you're passionate about. Build something you're passionate about, with a strong thesis around it. We never listened to potential customers who wanted something we disagreed with.
Five years of open source work created instant product-market fit
Build something that solves your own real problems first
Find customers who share your desired outcome - ignore those who dont
Side project passion can compound into massive businesses
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David achieved 4 milestones on the path to $100K ARR
The journey, decisions, and context behind this milestone
See the complete breakdown: launch strategy, validation methods, startup costs, expert analysis, replication playbook, and more actionable insights.
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