AI-assisted development on real legacy codebases.

Every AI coding tutorial uses a todo app. This is the other 99% of software: a decade-old production codebase, paying customers, and an AI pair that has to work inside all of it. War stories, workflows, and the bugs nobody blogs about — from a senior engineer shipping with AI every day.

A change order is the construction-industry document for modifying a project already under way. That's what we do to codebases.

Latest

Our LLM search feature fabricated results — the guardrail said "never fabricate IDs"

A production debugging story: why an AI summary invented search results that didn't exist, why the obvious fix makes it worse, and the three-layer fix that shipped.

The book

Change Order: AI-Assisted Development on a Real 10-Year-Old Production App— a playbook built from real production war stories, with the plan-file templates and prompt library included. Coming soon; the stories on this blog are chapters from it.