~ Ary Rabelo · Contract & fractional engineering · Rails since 2012
Your AI feature demos well and still is not in production.
I take it the rest of the way, into something your users can rely on.
I help US and EU founders and engineering managers ship the work stuck between a good demo and a reliable system, and rescue the production code nobody wants to touch. Contract and fractional, in English, based in Brazil on UTC-3 so I overlap your full US morning for same-day answers.
The thesis: shipped and inspectable beats a demo you cannot verify.
You do not need another proof of concept. You need the feature live, the risk where a human can catch it, and the smallest useful version first. That is what I do, and I run my own agents in production so you can read exactly how before you trust me with yours. You get written progress before your standup and decisions documented, so nothing lives only in my head and nothing waits a day for an answer.
Engineering
20 years
Rails since 2012. A platform at ~1.8M visits/month in production.
Focus now
AI agents
CLIs, AutoQA and command centers running in production.
Availability
US-friendly hours
Based in UTC-3, overlapping the full US morning. Contract and fractional engineering, in English.
Proof, not portfolio
All projects →Before you trust me with your system, you want to see how I run one. These are agents I operate in production, open end to end: evals on real examples, a human approving, the smallest useful workflow first, so you judge the engineering, not a screenshot.
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serpapi-agent-toolkit
2026Context-cheap SerpApi search for agents
CLI and Claude Code skill that gives agents context-cheap SerpApi search. Pure-function URL builder and parser, 37 offline tests, single compiled binary via bun build. About 17x fewer tokens per call than the default MCP.
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claude-code-harness
2026Contributions to a Go agent harness
Merged contributions to a Go agent harness: translated the guardrail engine messages (JP to EN) updating the tests in lockstep, and fixed the worktree-create hook.
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PlanQueue
2026Session notes that become a prompt queue
MIT plugin for Oh My Pi that renders session notes below the status line and runs them as a FIFO prompt queue: step-by-step, with auto-run and human-in-the-loop barriers (---). Each branch keeps its note; nothing is lost across sessions.