Fiona Fung leads the teams behind Claude Code and Cowork at Anthropic (overseeing Boris Cherny and the entire engineering and PM team). Before Anthropic, she spent 11 years at Microsoft building Visual Studio and TypeScript and then moved to Meta, where she started Facebook Marketplace (now generating over $100 billion in GMV annually), worked on Meta’s first smart glasses and AR glasses, and led infrastructure, growth, integrity, and safety teams at Instagram. She’s been an engineer for over 25 years and has a unique perspective on how the role of building software is changing.

In our in-depth conversation, we discuss: 1. What she’s learned about running a team that’s shipping 8x more code than before 2. Which roles AI will transform next 3. Specific ways her team uses AI 4. How Claude “routines” have changed how she operates as a manager 5. The context-switching problem no one has solved yet 6. The biggest unsolved problem in AI 7. What keeps her up at night — Brought to you by: WorkOS—Make your app enterprise-ready, with SSO, SCIM, RBAC, and more: workos.com/lenny Mercury—Radically different banking, now with Command: mercury.com — Where to find Fiona Fung: • LinkedIn: linkedin.com/in/fionafung — Where to find Lenny: • Newsletter: lennysnewsletter.com • X: twitter.com/lennysan • LinkedIn: linkedin.com/in/lennyrachitsky — In this episode, we cover: — References: lennysnewsletter.com/p/building… — Production and marketing by . For inquiries about sponsoring the podcast, email podcast@lennyrachitsky.com. — Lenny may be an investor in the companies discussed.