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Notes from the workbench

Practical engineering tips, design theory and performance breakdowns — written for developers and founders who like their advice tested in production.

Filtering by tag #legacy-code — clear

Engineering TipsMay 6, 2026

Working with Legacy Code: How to Change It Without Breaking It

Every developer inherits code they didn't write, without tests or documentation. How to understand an unfamiliar codebase quickly, add safety nets, refactor in small steps and avoid the big rewrite trap.

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