Brownfield

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Spec Kit Legacy Modernization Spec-Driven Development Brownfield Software Architecture Migration Strategy

Before You Copy Legacy Code: A Spec-to-Spec Migration Workflow for Modernizing One Feature

An exploratory, source-backed article on reverse-engineering one feature into current-state specs in the old repo, then using those artifacts to drive a safer implementation in a new repo and a new stack.

Apr 14, 2026 18 min read

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How to Reverse-Engineer an Existing Feature into GitHub Spec Kit Artifacts

A practical brownfield workflow for reconstructing one existing feature into spec.md, plan.md, tasks.md, and supporting Spec Kit artifacts without pretending you are starting from scratch.

Apr 13, 2026 16 min read

Luis Mori Guerra

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Before You Copy Legacy Code: A Spec-to-Spec Migration Workflow for Modernizing One Feature

How to Reverse-Engineer an Existing Feature into GitHub Spec Kit Artifacts

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