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Large Language ModelsHacker NewsPublished: Apr 21, 2026, 10:00 JST

1Password used AI agents to break apart its monolithic codebase — and found the approach faster and cheaper than human refactoring

1Password used AI agents to break apart its monolithic codebase — and found the approach faster and cheaper than human refactoring

1Password deployed AI agents (self-directed AI software that can plan and execute multi-step tasks) to refactor its monolith—a single, tightly-integrated codebase that had become difficult to modify. The company documented what worked, what failed, and the business case in a public blog post, providing concrete lessons for other engineering teams facing similar architecture problems.

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