Open to senior remote rolesBrazil · UTC−3
Nine years shipping web systems end to end — and proving it in public: open source that other people run, a Rust fiscal toolchain I maintain, and 12 PRs merged into NestJS core.
TypeScript · React / Next.js · Rust · Node · PostgreSQL · AI agents
01 — Selected work
Every number on this page links to its public source — repositories, package registries and merged pull requests.
Maintainer · Rust toolchain for Brazilian e-invoicing (NF-e)
A Rust port of sped-nfe (the most-used Brazilian fiscal library, 2,400+★ in PHP), released on crates.io and npm — the Node package ships native N-API bindings for seven platforms, published via OIDC trusted publishing with signed SLSA provenance. I review and merge community contributions and coordinate every release.
Open-source point of sale with a full Brazilian fiscal module
A complete POS — products, customers, orders, cashier — plus NF-e/NFC-e electronic invoicing: tax engine (ICMS/PIS/COFINS/IPI), XML digital signature, SEFAZ integration over mTLS, contingency modes. Next.js 16, React 19, tRPC v11, Drizzle and embedded PostgreSQL via PGLite — zero external dependencies to run.
Rust port of Anthropic's claude-agent-sdk
Drives the Claude CLI as a subprocess over the stream-json protocol, with full session management: fork, resume, transcript import, incremental summaries, and a pluggable SessionStore — in-memory, Postgres and Redis — all passing one shared conformance suite, validated against real databases.
Merged PRs in NestJS core and sped-nfe
Twelve pull requests merged into NestJS, approved by the framework's maintainer — plus PR #1313 into sped-nfe: 370 tests that took the PHP library's coverage from 40% to 86.5% while I ported it to Rust.
All public repos
Terminal-native AI coding assistant, from scratch in Rust
171 tests · 8.2k LOC
Minimal autonomous coding agent — the loop, exposed
~70 lines of logic
Fine-grained reactivity in Go/WASM — a completed experiment
149 tests · measured conclusion
Clay-style layout engine that renders PDFs, in TypeScript
npm · in production
Renderer-agnostic UI layout engine for Rust (Clay port)
zero-dep core · crates.io
AI journaling app — my LangGraph proof in public
6 stars · LangGraph StateGraph
3D low-poly virtual tabletop, peer-to-peer, in Rust/Bevy
WebRTC · no game server
Kick flaky Bluetooth into connecting — Linux/BlueZ CLI + TUI
crates.io
Honest-invalidation quant study on B3 equities
Zenodo DOI · 26 tests
GPU simulations: black holes, Schrödinger, Bell tests
9 simulations · GLSL + Python
My terminal-styled personal site with a PT-BR Wordle
xterm.js · event sourcing
Neural networks from scratch, drawn and trained in the browser
numpy only · React frontend
The Ijexá rhythm synthesized in pure Python
DSP · real samples
Weekly scheduler with hand-rolled drag and drop
React 19 · Zustand
Documentation site for fiscal-rs — Fumadocs, 29 pages
21 mermaid diagrams
This website — rebuilt in the open
Next 16 · 100% static
Windows Media Player Legacy clone in Rust (Dioxus)
Kanban board on Alpine.js — reactivity kept simple
TypeScript experiment
Archive (2016–2021)
02 — Case study
The strongest proof isn't a repo — it's what happens when other people start depending on one. fiscal-rs began as a port I wrote alone; today the community extends it and my job is to hold the line.
01
Community contributions across MDF-e, CT-e and NFS-e — reviewed, tested locally and shipped in coordinated crates.io releases.
02
Review blocked a symlink attack via predictable temp dirs and a panic on legacy A1 certificates — both reproduced before requesting changes.
03
The npm package had shipped broken since 0.7.0 and nobody noticed — there was no real consumer. I installed it, found it, fixed it, and moved publishing to OIDC with signed SLSA provenance.
Every claim above is public — the pull requests, the releases, the provenance log.
03 — Contact
I'm available and interviewing now. Email is the fastest way to reach me — I reply within a day.
