Alex Chen CEO
Former Lead Engineer at Google, Alex was the one who found the $2M bug. He built the first model to understand code semantics and drives Zento's vision for AI safety.
The origin story
The $2M Bug that changed everything
In October 2019, a simple integer overflow in the payment gateway went unnoticed for six months. The bug cost our client $2.1M in chargebacks, damaged their reputation, and shattered the trust of their users.
The engineering team was burned out, forced to review every single line of code manually to prevent recurrence. They spent more time arguing over semicolons than shipping features. That night, they built the first prototype of Zento to automate the drudgery and catch the edge cases humans miss.
We realized then that safety in software isn't a luxury—it's a necessity. Today, Zento protects over 50,000 engineers from making the same mistake.
Our Mission
To eliminate the fear of breaking production.
We believe every engineer deserves a safety net that never sleeps. Zento is the bridge between raw velocity and bulletproof code.
Leadership
The people behind the code
Sarah Jenkins CTO
A systems architect with 15 years of experience at Stripe and PayPal. Sarah ensures Zento's infrastructure can scale to millions of PRs without latency.
Culture
How we work
Speed
We ship features weekly. We value momentum, but we never value momentum over correctness. Zento gives us the confidence to move fast.
Honesty
We believe in radical transparency. If a model is hallucinating, we tell you. If a feature is delayed, we explain why. No corporate spin.
Craft
We obsess over the details. Our code is clean, our documentation is thorough, and our product feels like it was made by humans for humans.
Empathy
We build for the developer experience. We know code review is stressful, and we built Zento to make that stress disappear.
Journey
Our Timeline
OCT 2019
The Incident
The $2M bug is discovered. The founding team decides to build a solution.
JAN 2020
Zento Founded
Company launched from a garage in San Francisco. First 10 users onboarded.
JUL 2021
Series A
Raised $12M to expand the engineering team and build the test generation engine.
SEP 2023
50k Engineers
Reached 50,000 active users. Integration with GitHub, GitLab, and Bitbucket.
Backed By
Trusted by world-class investors
Sequoia Capital
Y Combinator
Greylock
Index Ventures
Join the team
We're always looking for builders, thinkers, and problem solvers. Check out our open roles below.
View Open PositionsShip faster. Break nothing.
Join 50,000+ engineers who use Zento to merge with confidence every day. Free plan available.