
Refactoring without the rewrite: how to decompose complex code
How to tell refactoring, decomposition, and a rewrite apart, pin the behavior of legacy code, and change structure in steps you can roll back.
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How to tell refactoring, decomposition, and a rewrite apart, pin the behavior of legacy code, and change structure in steps you can roll back.

Millions of lines, hundreds of tables, dozens of integrations: what AI grasps in hours, where it fails, how teams deploy RAG and repo indexing, and why expert + model beats either alone.

Why systems die from early architectural decisions, not outdated tech — and how to design for change, not features: module boundaries, domain modeling, data, ADRs, and a decade-long checklist.