Design Engineer — Rio de Janeiro
Oi! I'm Alex.
You can count on me to solve problems with design and code — taking your idea off paper and turning it into a product built entirely around your needs. Team player, supercharged by AI: today I go from a rough sketch to a published app on my own. Design and engineering, one pair of hands, for nearly 30 years.
Available Remote · UTC−3 · PT / EN
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Selected cases
Proof of work.
Testimonials
People I've shipped with.
Five voices, twenty years apart, one recurring phrase: “team player”.
Say oi
Let's talk.
Selected work
Work that
shipped.
Client work commissioned through OPTEN AG (Switzerland), products of my own for everyday use — health, study, driving — and the design work that built the foundation: Petrobras, Eleva, ODGO.
Hover a row — case preview follows the cursor
Lab
Experiments.
Little things I build to think out loud — where a design idea and a few lines of code meet.
AI · Security
Security Agent
A ReAct agent that hunts OWASP vulnerabilities in Python code — 14 deterministic patterns for instant findings, then a local LLM with RAG over the OWASP knowledge base for context and fixes. Runs fully offline on Ollama. It began as a retrieval assistant over pharmaceutical PDFs and was re-pointed at security material.
Angular · Utility
Swiss Holiday Tracker
Pick one of five cantons, a year, and the weekdays you actually work — then see which Swiss public holidays fall on a day you would have been at your desk. Angular 19 with Signals, settings kept locally, holidays fetched live from the OpenHolidays API.
Typography · DX
Projeto Typo
A page of the components a design system actually ships — forms, tables with ID numbers, buttons, alerts, a navbar — that re-renders in a new typeface the moment you pick one. Nine candidates, no reload. A specimen sheet flatters every face; these do not.
Just for fun
Snake Game Remix
Built in vanilla JavaScript for my son’s first time at a keyboard. The snake wraps at the edges and passes through its own body, so there is nothing to collide with — and no score, no clock, no game over. Snake read back with every failure condition taken out.
DX · Just for fun
UMP Theme
Ultimate Mega Power — a VS Code theme in light and dark, “for the most powerful geeks and nerds of the planet”. 1,217 installs on the marketplace.
About
Oi! I'm
Alex.
29y Web design since 1997
A multidisciplinary designer and software engineer. I take an idea from zero to a working product — from design all the way to code — with agile teams or solo.
- Base
- Rio de Janeiro · UTC−3
- Languages
- PT / EN
- Mode
- Agile teams or solo
Six eras.
Principles.
A personal note
“Quite simply, someone you can count on — loyal, honest, always on time. Add a sunny, positive character, and you have not only a valuable contributor but a joy to have on the team.”
Contact
Let's build
something
that ships.
Available Remote · UTC−3 · PT / EN



