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Lenny Rachitsky: belief

20 Apr 2025 Lenny's Podcast Building a magical AI code editor used by over 1 million developers in four months: The untold story of Windsurf | Varun Mohan (co-founder and CEO)

“Let me actually follow that thread because I think people may underestimate just how big of a deal that is.”

— Lenny Rachitsky

Source trail

Everything needed to verify it.

Speaker
Lenny Rachitsky
Attribution
Verified speaker
Claim type
belief
Recorded
20 Apr 2025
Publisher
Lenny's Podcast

Transcript context

…So I think maybe a handful of things that I could share. So on the product side, I think we've invested a lot in making sure code-based understanding for very large code bases is really high quality. And that's just because of where we started. We worked with some of the worlds are just companies like Dell, JPMorgan Chase. Companies like Dell have singular code bases that are over 100 million lines of code. So being able to understand that really, really quickly to make large scale changes is something that we've spent a lot of time doing. And that requires us actually building our own models that can consume large chunks of their code base in parallel across thousands of GPUs and almost rank them to be able to find out what the most important snippets of code are for any question that are asked about the code base. So we've gone out and built large distributed systems based on our infrastructure background to go ahead and do that. That's maybe one. Let me actually follow that thread because I think people may underestimate just how big of a deal that is. So when we talk about, we had the founders of Bolt and Lovable on the podcast, so those products, they build something from scratch, they built, they write the code for you. So that versus just loading, say, Windsurf on your million line code base, say, at Airbnb or Uber. Like, understanding what the hell you have and how it works and where to go change things without breaking it is insanely hard. And so what I'm hearing is that's kind of a big differentiator as you guys started there actually. And then Windsurf is now building up that advantage. That's right. Yeah. So that's a big thing that we spent a lot of time on, which is just understanding what the code base is doing. And actually one of the other things is, what are all the user interactions with respect to the code base? And happy to show that also in a bit here.…

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