Boris Cherny

Career

1. 
   Anthropic

   • Head of Applications, Member of Technical StaffSep 2024 – present
2. 
   Meta

   • Principal Software EngineerNov 2017 – Aug 2024
3. 
   Coatue Management

   • Architect, FrontendJan 2015 – Apr 2017
4. T
   Turn

   • Lead Software EngineerOct 2014 – Dec 2014
   • Senior Software EngineerJan 2014 – Sep 2014
5. A
   AgileMD

   • Software Engineer, FrontendJun 2012 – Jun 2013
6. F
   ForwardMetrics

   • Software EngineerNov 2011 – Jun 2012

Education

• Economics, UC San Diego, 2009-2011

Lesser-known facts

• Ran his first startup at 18 and studied economics at UC San Diego.
• Uninstalled his code editor after a month of not opening it.
• Said of joining Anthropic: "The model was ready and no one on the product side was realizing it."
• Early on, Claude Code wrote 10 to 20% of his code. Now over 90% of the Claude Code team's code is written with it.
• No longer prompts Claude directly. He writes loops that prompt Claude and work out what to build next.
• Runs five Claude Code sessions at once in separate git checkouts of the same repo, plus five to ten more on the web.
• Argues prompt engineering matters less than giving Claude a task that seems slightly too hard, plus a way to verify its own work.
• Published a team note called "I am often wrong" describing a six-step problem-solving method, and calls being wrong his favorite thing.

Known for

• Claude Code (2024)
• Programming TypeScript (O'Reilly)

Interviews and talks

• Computer History Museum conversation with curator David C. Brock (2026)computerhistory.org
• The Pragmatic Engineer on building Claude Code (2026)newsletter.pragmaticengineer.com