Building Claude Code with Boris Cherny

The conversation explores the evolution and impact of AI on software engineering, particularly through the lens of Claude Code, Anthropic's AI coding assistant. Boris Cherny, creator of Claude Code and former tech lead at Meta, discusses his journey from early coding projects to leading code quality initiatives across major platforms. He details Claude Code's development, from a side project born out of safety research to a widely adopted tool within Anthropic. The discussion highlights the shift in engineering workflows, emphasizing the increasing importance of adaptability, generalist skills, and the ability to manage AI-driven processes. Cherny draws parallels to the printing press revolution, suggesting AI could democratize coding, transforming software engineers into "authors" who orchestrate AI tools.

Outlines

Part 1: Background, Early Ventures

Part 2: Engineering Philosophy, Meta Experience

Part 3: Transition to Anthropic, Claude Code Genesis

Part 4: AI-Driven Development Workflow

Part 5: Architecture, Safety, Retrieval

Part 6: Team Culture, Prototyping

Part 7: Expanding Products: Co-work, Agent Teams

Part 8: Future Outlook, AI Safety, Conclusion

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The Pragmatic Engineer

Part 1: Background, Early Ventures

00:00Introduction to Boris Cherny and the Development of Claude Code at Anthropic

Introduction to Boris Cherny and the Development of Claude Code at Anthropic

01:57From Pokemon Cards to Weed Reviews: Boris Cherny's Early Coding Ventures

From Pokemon Cards to Weed Reviews: Boris Cherny's Early Coding Ventures

04:44Pivoting Startups: The Agile Diagnosis Story and the Quest for Product-Market Fit

Pivoting Startups: The Agile Diagnosis Story and the Quest for Product-Market Fit

Part 2: Engineering Philosophy, Meta Experience

07:32The Value of Outcome-Focused Engineering and the Rise of AI Code Verification

The Value of Outcome-Focused Engineering and the Rise of AI Code Verification

10:38From Freelancing to Facebook Groups: Boris Cherny's Early Career and Motivations

From Freelancing to Facebook Groups: Boris Cherny's Early Career and Motivations

13:51Instagram's Stack Challenges and Leading Code Quality at Meta

Instagram's Stack Challenges and Leading Code Quality at Meta

17:02Measuring Code Quality's Impact on Engineering Productivity at Meta

Measuring Code Quality's Impact on Engineering Productivity at Meta

Part 3: Transition to Anthropic, Claude Code Genesis

19:45Joining Anthropic and the "Fuel the AGI" Moment with Claude

Joining Anthropic and the "Fuel the AGI" Moment with Claude

21:47StatSig Advertisement

StatSig Advertisement

23:03The Genesis of Claude Code: From Chatbot to Tool-Using Agent

The Genesis of Claude Code: From Chatbot to Tool-Using Agent

27:04Internal Debate and the Decision to Release Claude Code for Safety Research

Internal Debate and the Decision to Release Claude Code for Safety Research

Part 4: AI-Driven Development Workflow

28:32Claude Code's Rapid Adoption and Boris's Shift to AI-Driven Coding

Claude Code's Rapid Adoption and Boris's Shift to AI-Driven Coding

31:08The Instant Switch to AI-Driven Coding with Opus 4.5 and Development Workflow

The Instant Switch to AI-Driven Coding with Opus 4.5 and Development Workflow

33:48Parallelism, Git WorkTrees, and the Unexpected Use of the iOS App

Parallelism, Git WorkTrees, and the Unexpected Use of the iOS App

37:12From Code Review to Lint Rules: Automating Tedious Work

From Code Review to Lint Rules: Automating Tedious Work

42:03AI-Assisted Code Review: Claude Code's Role in Bug Detection and Prevention

AI-Assisted Code Review: Claude Code's Role in Bug Detection and Prevention

Part 5: Architecture, Safety, Retrieval

45:11WorkOS Advertisement

WorkOS Advertisement

47:13Claude Code Architecture and Multi-Layered Safety Measures

Claude Code Architecture and Multi-Layered Safety Measures

49:40From RAG to Agentic Search: Simplifying Claude Code's Retrieval Mechanisms

From RAG to Agentic Search: Simplifying Claude Code's Retrieval Mechanisms

52:05Permissioning Complexity and the Origin of Permission Prompts

Permissioning Complexity and the Origin of Permission Prompts

Part 6: Team Culture, Prototyping

55:04The "Member of Technical Staff" Title and the Rise of the Generalist

The "Member of Technical Staff" Title and the Rise of the Generalist

57:25The Shift Towards Prototyping and Building Over Writing PRDs

The Shift Towards Prototyping and Building Over Writing PRDs

1:00:21The Importance of Humility and Experimentation in a Changing Landscape

The Importance of Humility and Experimentation in a Changing Landscape

1:02:28Iterative Development and the Use of Coordination Systems for Models

Iterative Development and the Use of Coordination Systems for Models

Part 7: Expanding Products: Co-work, Agent Teams

1:05:16Building Co-work: Addressing the Needs of Non-Engineers

Building Co-work: Addressing the Needs of Non-Engineers

1:08:40Co-work's Architecture, Safety Measures, and Chrome Extension Integration

Co-work's Architecture, Safety Measures, and Chrome Extension Integration

1:11:14Tech Stack and the Rationale Behind Launching Co-work on macOS First

Tech Stack and the Rationale Behind Launching Co-work on macOS First

1:12:48Observability, Monitoring, and the Importance of Privacy

Observability, Monitoring, and the Importance of Privacy

1:14:00Agent Teams: Extending Claude Code's Capabilities with Swarms

Agent Teams: Extending Claude Code's Capabilities with Swarms

1:17:19Use Cases for Agent Teams and the Importance of Experimentation

Use Cases for Agent Teams and the Importance of Experimentation

Part 8: Future Outlook, AI Safety, Conclusion

1:19:43Embracing Change and the Beginner Mindset in the Age of AI

Embracing Change and the Beginner Mindset in the Age of AI

1:22:31Coding as a Means to an End: From Art to Practicality

Coding as a Means to an End: From Art to Practicality

1:25:46The Printing Press Analogy: AI as a Transformative Force

The Printing Press Analogy: AI as a Transformative Force

1:29:03The Future of Software Engineering: New Careers and Expanded Reach

The Future of Software Engineering: New Careers and Expanded Reach

1:31:13A Belief Change: The Growing Importance of AI Safety

A Belief Change: The Growing Importance of AI Safety