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.
What she’s learned about running a team that’s shipping 8x more code than before
Which roles AI will transform next
Specific ways her team uses AI
How Claude “routines” have changed how she operates as a manager
The context-switching problem no one has solved yet
The biggest unsolved problem in AI
What keeps her up at night
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• LinkedIn: linkedin.com/in/fionafung
• Running an AI-native engineering org: https://www.youtube.com/watch?v=igO8iyca2_g
• Head of Claude Code: What happens after coding is solved | Boris Cherny: https://www.lennysnewsletter.com/p/head-of-claude-code-what-happens
• Today, Anthropic engineers on average ship 8x as much code per quarter as they did compared to 2021-2025: https://x.com/AnthropicAI/status/2062568864240836995
• Visual Studio: https://visualstudio.microsoft.com
• Joseph Campbell’s quote: https://www.goodreads.com/quotes/192665-the-cave-you-fear-to-enter-holds-the-treasure-you
• Life-changing Cowork use case: https://x.com/lennysan/status/2059664455001334124
• Introducing Claude for Small Business: https://www.anthropic.com/news/claude-for-small-business
• Conversations with Tyler podcast: https://conversationswithtyler.com
• Sheryl Sandberg on Facebook: https://www.facebook.com/sheryl#
• Amélie on Prime Video: https://www.amazon.com/Amelie-Jean-Pierre-Jeunet/dp/B0DQ4S3N45
• Spirited Away on HBO Max: https://www.hbomax.com/movies/spirited-away/3deab668-d0a4-4a8d-9bc8-0952a0ad836e
• Nausicaä of the Valley of the Wind on HBO Max: https://www.hbomax.com/movies/nausicaa-of-the-valley-of-the-wind/ed66031b-6353-4019-ba54-35488468a4db
• Sweet Sisters Bodycare: https://sweetsistersbodycare.com
• Anthropic events: https://www.anthropic.com/events
• Clare Pooley’s quote: https://www.goodreads.com/quotes/11305360-in-a-world-where-you-can-be-anything-be-kind
• Margaret Atwood’s books: https://www.amazon.com/stores/author/B000AQTHI0?ccs_id=0027a474-cd59-4a3a-bcd7-9b173c27d530
• Haruki Murakami’s books: https://www.amazon.com/stores/Haruki-Murakami/author/B000AP7AFI
• The Little Prince: https://www.amazon.com/Little-Prince-Antoine-Saint-Exup%C3%A9ry/dp/0156012197
• Nausicaä of the Valley of the Wind: https://www.amazon.com/Nausica%C3%A4-Valley-Wind-Box-Set/dp/1421550644
• High Output Management: https://www.amazon.com/High-Output-Management-Andrew-Grove/dp/0679762884
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Lenny may be an investor in the companies discussed.