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Achievement: Pair Extraordinairex2Achievement: Pull Sharkx2Achievement: YOLO

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fabiomarcellusdev/README.md

Hi, I’m Fabio 👋

Senior Software Engineer · US Central Time · Remote

I build modern web applications and developer tooling, with more than 5 years of professional experience. I care about architecture, performance, accessibility and long-term maintainability as much as shipping features.

What I’m Building Now

  • Undisclosed 3D Sculpting Software: a performance-critical desktop application in modern C++, in private development. I run it with performance targets fixed before the work, decision records, and cross-platform CI.
  • ai-ir-tokens: a planned open-source layer that lets AI coding agents read and edit TypeScript, JavaScript, HTML and CSS with far fewer tokens. The goal is at least 40% fewer tokens with no loss in task pass rate, and the project measures before it builds.
  • agentic-project-template: a starting point for projects built with AI coding agents: tool-neutral instructions, supply-chain rules, defences against prompt injection, and milestone checks that run in git hooks and CI.
  • My portfolio site: a static Next.js site that updates itself from my public and private work, without exposing private details. Coming soon.

What I Focus On

  • Designing scalable frontend architectures (Clean / Hexagonal Architecture)
  • Building and maintaining component libraries and design systems
  • Defining testing strategies (unit, integration, E2E, visual regression)
  • Performance optimization and Core Web Vitals
  • Accessibility-first development (WCAG 2.2)
  • Safe, measurable AI-assisted engineering: agent security, supply-chain controls, and gates that can fail
  • Collaborating closely with design, product, backend, and QA teams

Tech I Work With

Frontend

  • React, Next.js, TypeScript
  • Redux (client state), React Query (server state)
  • HTML, CSS, Tailwind

Architecture & Data

  • Frontend System Design
  • Clean Architecture, Hexagonal Architecture
  • REST APIs, GraphQL, API Contracts

Testing & Quality

  • Jest, React Testing Library
  • Cypress, Playwright
  • Cucumber, Gherkin
  • Mock Service Worker (MSW)
  • Storybook, Chromatic (visual regression)

Performance & Delivery

  • Core Web Vitals, Lighthouse
  • Docker, CI/CD pipelines

AI-Assisted Development

  • Claude Code, MCP servers, agent guardrails and evaluation

How I Think About Engineering

I treat applications as long-lived systems, not just collections of features.

That means:

  • Separating domain logic from frameworks
  • Being intentional about state ownership and data flow
  • Choosing testing approaches based on risk, not dogma
  • Measuring before claiming “faster” or “better”
  • Making tradeoffs explicit and documented in decision records

Get in Touch

Popular repositories Loading

  1. fabiomarcellusdev fabiomarcellusdev Public

  2. ai-ir-tokens ai-ir-tokens Public

    Fewer tokens for AI coding agents that read and edit TypeScript, JavaScript, HTML and CSS codebases. Planning stage.

    JavaScript

  3. ai-ir-experiment ai-ir-experiment Public

    JavaScript