I gave Codex a single goal and left it a few days; I came back to a week's worth of code stacked across a dozen-odd tables. It ran fine, but it was more than I could review. The story of finishing a production migration with two AIs running side by side — and the one time I had to stop it.
While inspecting pre-launch data, a check I'd stood up in code caught a purchase-cost error worth billions of won. After the four weeks I burned in Part 1, the story of the fences and recorders I bolted on to hold the AI in place — up to the moment it first earned its keep.
When the migration lead left, the company's most complex system landed whole on me, two years and three months in. A domain I'd never touched, and a first four weeks spent leaning on AI. Only then did I change direction.
I attended OpenAI's 'Build with OpenAI' builder session. The opening talk, a challenge where Codex itself plays the screen you build, and what I took home from the day.