Inside Anthropic: How AI Is Reshaping Software Engineering Practices

The Pragmatic Engineer · rss · 2026-07-28

The Pragmatic Engineer visited Anthropic's HQ and interviewed four engineers to learn how AI tools are changing software building. Key findings: complex projects like Claude Managed Agents require six months of planning and PRDs; Bun's rewrite of 500K+ lines to Rust took 11 days and $165K in tokens; engineering practices are shifting: prototyping is more fluid, verification takes longer than implementation, code review and testing are increasingly AI-driven; team sizes remain two-pizza teams but with max two engineers per project.

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