How engineers at Nextdoor use Codex to build without limits

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On Nextdoor’s core platform team, Codex investigates issues and puts product engineers in the driver’s seat.

A product like Nextdoor, which serves over 110 million users across 11 countries, puts many demands on a platform team. For Cory Dolphin, Head of Engineering at, Codex represents an essential shift: “away from iteratively prompting an agent, and towards outcome engineering, where engineers start to think about the result they want to see and work with an agent to engineer that result.”

This means that individual engineers move up the stack—no longer locked up as specialists in a certain system or framework, they’re able to own the product experience more or less end-to-end, even across multiple platforms. Productivity has accelerated so much that the bottleneck is no longer engineering, but rather the hard strategic questions about what to build next.

With Codex, “engineers get to spend a lot less time thinking about exactly how they build, and more time thinking