Day work
Large-scale Clojure systems that need to stay boring.
At Nubank I work in the kind of production environment where correctness, operability, and simple mental models matter more than theatrical architecture.
Marcos Augusto / Brazil / SWE at Nubank
I build systems, tools, and agent workflows that survive contact with real work.
Clojure in production, Flutter and TypeScript for personal tools, and a growing lab of agent skills, harnesses, and orchestration patterns.
What you get here
Three threads, one engineer.
Current obsession
Agent skills, harnesses, and orchestration for daily engineering.
I am building practical agent infrastructure: reusable skills, evaluation harnesses, and workflows that make coding agents more dependable instead of just more flashy.
Personal lab
Small apps that turn personal annoyances into useful interfaces.
Finance trackers, receipt readers, sim-racing dashboards, and experiments in Flutter, Next.js, TypeScript, and whatever else the problem wants.
Project map
Enough context before the click.
Personal finance
Financial stack
A long-running thread across web, mobile, and backend experiments for understanding personal money flows through interfaces I actually use.
Frontend architectureMicro frontwindows
Experiments around windows, component boundaries, and micro-frontend ideas before they become heavy platform decisions.
Writing and researchAgent notebook
Notes from building with coding agents: what belongs in skills, what needs tests, and where human taste still has to steer.
Recent writing
The lab notebook.
- Skills are not prompts
A note on what I learned from using, borrowing, and curating agent skills: the useful part is not the prose, it is the operational boundary.