# Julian De Leon

> Julian De Leon is a Product & AI Engineer in Buenos Aires, working on agentic engineering: coding agents doing real work across the software lifecycle.

Julian De Leon is a Product & AI Engineer based in Buenos Aires, focused on agentic engineering: AI agents doing real work across the software lifecycle (planning, writing, reviewing, testing and shipping code) and the evals, traces and human approval gates that make that work dependable. He currently leads AI and software at MarketFully and teaches engineering at Universidad del CEMA.

## Lab

Questions about software factories, each with H0 and H1 written before the work, and the result.

- [Does a software factory write mergeable code more often than a single coding agent?](https://juliandeleon.me/lab#hypothesis-01) H0: A software factory writes mergeable code no more often than a single coding agent. H1: A software factory writes mergeable code more often than a single coding agent. Status: open.

## Writing

- [Build your own tools](https://juliandeleon.me/notes/build-your-own-tools): Building a tool for one task is now cheap, so I build a lot of them. (2026-10-26)
- [Software for one](https://juliandeleon.me/notes/software-for-one): I built two apps for myself in one day. Both fit exactly how I work. (2026-09-27)
- [It's never done](https://juliandeleon.me/notes/its-never-done): Most of what I care about is an infinite game. (2026-09-18)
- [What Your Agent Sessions Say About Your Project](https://juliandeleon.me/writing/what-your-agent-sessions-say-about-your-project): Coding agents write down everything and nobody reads it back. Why I built Ronda, and what your own sessions tell you about the problem you are solving. (2026-09-17)
- [Never trust your browser tabs](https://juliandeleon.me/notes/never-trust-browser-tabs): Tabs are not a research system. I learned that with 120 of them. (2026-09-14)
- [Building a Coding Agent from Scratch](https://juliandeleon.me/writing/building-a-minimal-coding-agent): How a coding agent can be built: a 15-line loop at the center, and the tools, permissions, and recovery that make it usable. (2026-09-13)
- [Why Coding Agents Need a Process](https://juliandeleon.me/writing/why-coding-agents-need-a-process): Why I built Branch, a CLI that installs an idea-to-ship workflow for coding agents as skills. (2026-09-12)
- [Build things](https://juliandeleon.me/notes/build-things): Anyone can build what they want now. That still gets me out of bed. (2026-09-12)
- [Outwork the room](https://juliandeleon.me/notes/outwork-the-room): Talent varies. Effort is a choice, so there is no excuse not to be the one who works the most. (2026-09-10)
- [Just do it](https://juliandeleon.me/notes/just-do-it): If something excites you, do it. Optimize for energy. (2026-09-07)
- [Work like it matters](https://juliandeleon.me/notes/work-like-it-matters): Treat what you build as if it were the most important thing in the world. (2025-01-23)

## Projects

- [anturno](https://anturno.cloud/) (2026; building; TypeScript, Bun, Next.js, Nitro, SQLite): An AI software factory. Work comes in from GitHub, Linear, Slack or a form, and coding agents take it through triage, planning, building and review in isolated sandboxes. A human merges.
- [Ronda](https://tryronda.cloud/) (2026; active; Rust, Tauri, React, SQLite): Every agent buries its sessions in a different hidden folder. Ronda indexes all of them into one local library: search any transcript in about 26 ms, see where your time went and which errors keep coming back, and resume a session in a built-in terminal. Open source, nothing uploaded. Source: https://github.com/tryronda/ronda.
- [nod](https://nod.anturno.cloud/) (2026; active; TypeScript, Bun): Describe a task and nod reads the code, edits files, runs the tests, and asks before anything risky. Source: https://github.com/anturno/nod.
- [Branch](https://branch.anturno.cloud/) (2026; active; TypeScript, Bun, Claude Code): Scans a repo and installs an idea-to-ship workflow as agent skills: idea, plan, build, review, ship, reflect. Open source, on npm as @anturno/branch. Source: https://github.com/anturno/branch.

## Pages

- [Home](https://juliandeleon.me/): introduction and projects
- [About](https://juliandeleon.me/about): background and work history
- [Lab](https://juliandeleon.me/lab): questions about software factories, with H0, H1 and results
- [Writing](https://juliandeleon.me/writing): essays and short notes
- [Projects](https://juliandeleon.me/projects): things built

## Contact

- GitHub: https://github.com/JLeonStack
- X: https://x.com/juli_deleon
- LinkedIn: https://www.linkedin.com/in/julian-de-leon

## Feeds

- RSS: https://juliandeleon.me/rss.xml
- Sitemap: https://juliandeleon.me/sitemap.xml