Software engineer in Brazil, currently working at Nubank. Most of my day job lives in Clojure and large production systems, where the best code is often the code that keeps the system understandable under pressure.

Outside work, I build small tools for problems I actually have: personal finance, expense reading, investment tracking, sim-racing telemetry, and agent workflows that make coding assistants easier to steer.

I write at maugustosemperfi.github.io.

Agent workflows
Not "make the model smarter" prompts. I am interested in skills, harnesses, review loops, and small procedures that make agents more dependable during real engineering work.

Clojure in production
Large systems, incident-shaped debugging, data-oriented design, and the discipline that has to replace compiler guarantees in dynamic codebases.

Personal software
Tools for one user, built seriously: finance dashboards, readers, trackers, and interfaces that only need to be useful enough to earn their place in my own week.

Dense interfaces
Sim racing dashboards have taught me a lot about glanceable information, visual hierarchy, and what UI feels like when attention is scarce.

Clojure TypeScript Next.js Flutter Dart Python Postgres

Also using and experimenting with opencode, Claude Code, Codex, and agent skill workflows.

• cli-dm — a dungeon-map visualization for Claude Code sessions and parallel agent work.
• agent-skills — reusable, highly technical Codex and agent skills for tracking, reviewing, and syncing agent workflows.
• Fatura Reader — a local-first Brazilian credit-card statement reader that parses PDFs in the browser without uploading financial data.
• Acordo — AI-assisted proposals, shareable links, client tracking, and one-click acceptance for Brazilian freelancers and small businesses.
• Personal site and blog — writing, project notes, and a place to make the work legible.

Some older public repositories are still useful as history, especially the finance and frontend experiments. The current work I care most about is moving toward agent infrastructure, local-first finance tools, and small product surfaces with real daily use.

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