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Dev.to
7/9/2026
Stop Treating Legacy Systems as the Enemy

Stop Treating Legacy Systems as the Enemy

Short summary

The article argues against treating legacy systems as enemies, advocating evolutionary maintenance over total rewrites. It presents a real example of AI-assisted migration from Fluent Assertions to Shouldly across 3,000+ tests, where AI caught a hidden Lamar-Marten dependency and compressed a multi-week effort into two days. The key lesson: feed AI current documentation and rely on automated tests as a safety net.

  • •Legacy systems survive because they solve real problems; treat them as foundations, not liabilities
  • •Evolutionary maintenance with AI assistance and automated tests beats risky full rewrites
  • •Real example: AI-assisted library migration across 3,000+ tests completed in two days, catching hidden dependencies

Generated with AI, which can make mistakes.

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