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irwinarruda/README.md

Irwin Arruda Irwin Arruda

Software engineer · Tools and guardrails for coding agents

irwinarruda.com · LinkedIn · X · Email

I'm a software engineer in Goiânia, Brazil, working mostly in TypeScript and React, with C#/.NET on the back end. I like building what makes other developers' work easier: design systems, CLIs, build tooling and, lately, guardrails for coding agents.

Much of my work now is making coding agents reliable inside a team. The guardrails are the ordinary ones, applied strictly: integration tests, linting, type checks, CI and automated code review, plus the specs and skills that teach an agent the codebase.

favo favo Every AI subscription you have, on every computer you own.
favo-cli is the CLI I built and use every day. It runs Claude Code, Codex, Antigravity CLI and OpenCode under as many accounts as you have, at the same time, on all your machines.

npm install --global favo-cli

Writing

  • An essay on frontend architecture: a journey through software architecture literature, in search of a model for declarative frontend frameworks.
  • Token usage: every token my coding agents have processed, counted by favo usage.

Pinned Loading

  1. favo-cli favo-cli Public

    Keep every AI subscription on every computer you own, without logging in and out.

    TypeScript

  2. .agents .agents Public

    Personal agent instructions and reusable skills

    JavaScript

  3. the-chatbot-v2 the-chatbot-v2 Public

    A personal assistant that lives in WhatsApp — and is slowly growing a face on the web.

    TypeScript

  4. irwin-ui irwin-ui Public

    The design system behind Irwin Arruda's sites, apps and tools: color rules, type, brand marks and patterns. Themes plug in.

    TypeScript

  5. mobx-simple-store mobx-simple-store Public

    Mobx Simple Store (also MSS) is a wrapper around Mobx that helps the user create a reactive state tree store with an opinionated structure and setters that can read JSON objects.

    TypeScript 3

  6. irwin-notes irwin-notes Public

    My blog/portfolio

    TypeScript