Start here 6 min read
How I run AI agents on production code
For six months a fleet of AI coding agents has done most of my production work. The agents were never the hard part. This is the machinery that makes it safe.
Lucas Firmo · Senior iOS engineer
I build iOS apps, and the AI agent systems that help ship them.
Practical notes from 13 years of Swift and from running a fleet of AI coding agents on production code. Short, tested, and written for working engineers.
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Every page returned 200. Some were still broken.
What I learned moving a website from Gatsby to Next.js one route at a time, and why the status code was the least useful check.
4 min read
I'm migrating a website with a fleet of AI agents
Each agent takes one page. I decide the order, approve anything that touches production, and fix the rules when something slips. Here is how it works and what still went wrong.
3 min read
All tests pass. The feature is still broken.
My agents kept saying "all tests pass". So now they cannot open a PR without proof inside it.
3 min read
The minute I walk out, nothing gets shipped
My agents could see every problem. None of them could fix one, so every problem waited for me.
2 min read
I moved our production app to Swift 6 in 10 days. Here's what it took.
No big-bang rewrite. Small PRs, a warnings baseline on every PR and tests on the old code before touching it.
What I write about
iOS and Swift
SwiftUI, Swift 6 concurrency and the patterns that hold up in a large production app.
AI agents on real code
How to run coding agents on a production codebase with review, proof and guardrails.
Engineering practice
Small reviewable steps, tests that fail first, and measuring before and after.
Open to senior iOS and applied AI work
Remote from São Paulo, working US hours. Contractor or EOR, no visa needed.
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