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Published · transcript-backedMike Krieger: preference
5 Jun 2025 Lenny's Podcast Anthropic’s CPO on what comes next | Mike Krieger (co-founder of Instagram)
“Most of the rest of Anthropic is written in Python, some Go, some Rust now, but we're not like a TypeScript shop. And so I saw a great comment yesterday in our Slack where somebody had this thing that was driving them crazy about Claude Code and they're like, "Well, I don't know any TypeScript, I'm just going to talk to Claude about it and do it.”
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Everything needed to verify it.
- Speaker
- Mike Krieger
- Attribution
- Verified speaker
- Claim type
- preference
- Recorded
- 5 Jun 2025
- Publisher
- Lenny's Podcast
Transcript context
…I love that. Do you have a sense of what percentage of Claude Code is written by Claude Code? At this point, I would be shocked if it wasn't 95% plus. I'd have to ask Boris and the other tech leads on there. But what's been cool is so nitty-gritty stuff, Claude Code is written in TypeScript. It's actually our largest TypeScript project. Most of the rest of Anthropic is written in Python, some Go, some Rust now, but we're not like a TypeScript shop. And so I saw a great comment yesterday in our Slack where somebody had this thing that was driving them crazy about Claude Code and they're like, "Well, I don't know any TypeScript, I'm just going to talk to Claude about it and do it. " And they went from that to pull requests in an hour and solve their problem and they submitted a pull request and that breaking down the barriers. One, it changes your barrier to entry for any kind of newcomer to the project. I think it can let you choose the right language for the right job for example. I think that helps as well, but I think it also just reinforces Claude Code being that patient alpha of that where contributions from outside the team can be Claude coded as well. Wow, this is, it's just continue to blow my mind all these things that you're sharing, 95% of Claude Code is written by Claude Code roughly.…
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