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Proliferate (YC S25) is hiring to building open source Codex

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About Proliferate

Proliferate is building the operating system for modern engineering.

We are building the company in person in SoMa, San Francisco. We care a lot about intensity, craft, and working with people who want to do the best work of their careers. We work hard, and we also take health seriously: company-expensed Whoop, meaningful health and wellness budget, and top-tier insurance.

About the Founder

I (Pablo) finished my master's in AI at 19 and joined Onyx (YC W24) as engineer #1, where I spent a year building enterprise AI search before starting Proliferate. You can see what I shipped there here. We’ll be working closely together.

About the Role

You’d be one of our first engineering hires and build the core product. This is a high-ownership role across product, systems, and user experience.

Example work:

Build a new core workflow end to end across agent runtime, product UI, and cloud infrastructure.

Design and ship a new interface for human-agent collaboration made possible by a model capability that landed last week.

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