Boris Cherny

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396 appearances 1 recordings 1 series first heard Jul 2026 last heard 28 Jul

Boris Cherny’s voice in public audio — every appearance, attributed to the second.

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Y Combinator Startup Podcast · Boris Cherny: Building Claude Code · 28 Jul 2026 podcast

And so what he did was essentially he defined a test suite.

The nice thing about Bunn is it's very, very well tested.

There's a big test suite in Bunn, there's a big test suite in Node.js, so it's easy to know if you did the right thing.

And he had the model rewrite it from Zig to Rust.

It was one prompt, it was a dynamic workflow, and dynamic workflows are a feature in Cloud Code that essentially let you orchestrate dozens, hundreds, thousands of agents to do work productively.

And it ran for 11 days, and it rewrote the entire code base.

It was one shot with, no, it wasn't one shot, but there was steering, there was steering.

But previous models just couldn't do this, even with the steering.

It just wouldn't have been possible.

Definitely over a year.

Yeah, over a year.

This is like over 100,000.

JavaScript runtime is really complicated.

There's a lot of stuff in there.

And yeah, it works.

This is in production now.

This is what quad code uses now when you're running it.

So this is kind of one example.

I would give a second example, so a product overhang.

So this is a practical use case where there's a problem you're solving.

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