Hi, I’m Atirson Fabiano

Senior ReactEngineer

React Web & React Native · TypeScript · Next.js · AI-First Development

Senior Software Engineer with 7+ years of experience building production-grade React Web and React Native applications for high-traffic products serving millions of users. I own architectural decisions end to end — from micro-frontends and design systems to performance, caching and test strategy — and I use Claude, Gemini and AI coding agents daily to ship faster without lowering the quality bar.

Remote from Brazil (LATAM) · Experience with U.S. and European clients · English: full professional proficiency

Atirson Fabiano — Senior React EngineerAtirson Fabiano at his work setupAtirson Fabiano presenting a project

Impact in numbers

1M+

monthly visits on a telecom sales platform I led from zero to production

6M

active consultants served at 100K+ requests per minute

−99%

service requests after a CMS caching refactor (3.29M → 34K per month)

17% → 90%

automated test coverage on a U.S. financial onboarding platform

Companies and products I’ve worked on

  • GFT Technologies
  • Zup Innovation
  • Vivo
  • CI&T
  • Natura
  • Avon
  • AB InBev
  • Driveway (USA)
  • Pottencial Seguradora

Experience & case studies

High-impact products I’ve built for companies and clients — the challenge, what I did, and the result

Customer Onboarding Platform

GFT Technologies · U.S. financial institution (confidential)

Senior Software Engineer · Mar 2026 – Present

Challenge

A U.S. financial institution needed a bilingual, mobile-first onboarding platform to support new customer acquisition, in a confidential financial-services environment.

What I did

  • Leading front-end development of the platform with Next.js and TypeScript
  • Building financial integrations and automated workflows across n8n, MuleSoft and Q2, making independent architectural and integration decisions
  • Refactored Headless CMS integrations and implemented caching strategies, cutting infrastructure costs and improving scalability
  • Raised automated test coverage to a mandatory minimum of 90% while eliminating SonarQube code smells
  • Improved CI/CD reliability and deployment workflows with GitHub Actions and ArgoCD

Impact

Service requests reduced from 3.29M to 34K per month, and test coverage raised from 17% to 90%

Tech Stack

  • Next.js
  • ReactJS
  • TypeScript
  • Jest
  • GraphQL
  • DatoCMS
  • n8n
  • MuleSoft
  • Q2
  • GitHub Actions
  • ArgoCD
  • TailwindCSS

Vivo Fibra Lite

Zup Innovation · Vivo

Senior Software Engineer · May 2025 – Mar 2026

View Project

Challenge

Launch a new telecom sales platform for optical fiber internet with credit-card billing, from zero to production.

What I did

  • Owned all front-end architectural decisions end to end
  • Defined best practices for code quality, testing and performance; reviewed PRs and enforced HOC/Composition patterns and coding standards
  • Implemented unit and mutation testing with Jest and Stryker Mutator
  • Managed data fetching and caching with React Query for a fast, resilient UX
  • Built and maintained CI/CD pipelines with ArgoCD on Kubernetes, with Grafana for monitoring and observability
  • Integrated Stackspot AI to create custom agents, knowledge sources and quick commands with VSCode integration

Impact

1,000,000+ visits per month and over R$100K in monthly revenue

Tech Stack

  • ReactJS
  • TypeScript
  • React Query
  • Zustand
  • Redux
  • Jest
  • Stryker Mutator
  • Kubernetes
  • ArgoCD
  • Grafana
  • GitHub Actions
  • Stackspot AI

Vitrine

CI&T · Natura & Avon

Software Engineer · May 2022 – Apr 2025

View Project

Challenge

Natura and Avon needed a consultant platform able to handle very high traffic from millions of active consultants.

What I did

  • Led development of Vitrine, the high-traffic consultant platform
  • Optimized performance, quality and reliability under heavy load
  • Collaborated with multidisciplinary teams to deliver a high-impact solution

Impact

Scaled to 100K+ requests per minute for 6 million active consultants

Tech Stack

  • ReactJS
  • TypeScript
  • Micro-frontends
  • Storybook
  • Jest
  • Cypress

Multi-country E-commerce

CI&T · AB InBev

Software Engineer · May 2022 – Apr 2025

Challenge

Expand an e-commerce platform to new markets with country-specific localization.

What I did

  • Expanded and localized the platform for the UK, Germany, Belgium, the Netherlands and Bolivia
  • Implemented unit and behavior-driven tests to keep releases safe across markets

Impact

Launched in 5 countries, increasing sales and profitability

Tech Stack

  • ReactJS
  • TypeScript
  • Jest
  • Cypress
  • Jenkins

Driveway

CI&T · Driveway (USA)

Software Engineer · May 2022 – Apr 2025

View Project

Challenge

Improve the online vehicle sales experience on a U.S. platform.

What I did

  • Built high-quality, reusable Design System components used across the sales experience
  • Investigated and resolved critical bugs, ensuring product stability
  • Managed release cycles and contributed to continuous deployment workflows
  • Implemented unit and behavioral tests with Jest and Playwright

Tech Stack

  • ReactJS
  • TypeScript
  • Design System
  • Storybook
  • Jest
  • Playwright

Broker Management & Invoicing

Squadra Tecnologia · Pottencial Seguradora

Full-Stack Developer · Mar 2020 – Apr 2022

Challenge

An insurance company needed a broker-management system for quotations, policies and contract issuance, plus invoice and financial workflows.

What I did

  • Built the architecture and features of the broker-management system with ReactJS, Redux and Context API
  • Developed invoice management and financial workflow features running on AWS

Impact

Around R$1 billion in invoices processed

Tech Stack

  • ReactJS
  • Redux
  • Context API
  • Single-SPA
  • PHP (Laravel)
  • Node.js
  • AWS
  • Azure DevOps

AI-First Engineering

AI is part of how I deliver every day — with engineering judgment, tests and code review still in charge.

91.7%

less execution time on smaller tasks

66.7%

less execution time on larger tasks

  • Claude and Gemini in my daily workflow for coding, code review and workflow automation
  • Built custom Stackspot AI agents, knowledge sources and quick commands with VSCode integration, embedding AI tooling into a whole team’s workflow
  • This site is maintained with Claude Code agents and skills for architecture review, implementation, SEO and release checks
See how this site is built →

Skills

React & Mobile

  • ReactJS
  • Next.js
  • React Native (iOS/Android)
  • TypeScript
  • JavaScript

Architecture

  • Micro-frontends (Single-SPA)
  • Design systems
  • Component-driven architecture
  • Performance optimization

State & Data

  • React Query
  • Redux
  • Zustand
  • Context API
  • GraphQL

Testing & Quality

  • Jest
  • Stryker Mutator
  • Cypress
  • Playwright
  • SonarCloud

DevOps

  • Docker
  • Kubernetes
  • GitHub Actions
  • ArgoCD
  • Jenkins
  • Azure DevOps
  • Grafana

Back-End & Data

  • Node.js (Express)
  • PHP (Laravel)
  • PostgreSQL
  • MySQL
  • MongoDB
  • Redis

Education & Languages

Postgraduate — Artificial Intelligence and Data Science

UniEvangélica University

2025 – 2026 (in progress)

Bachelor’s Degree — Software Engineering

UniEvangélica University

2018 – 2021

Portuguese — Native · English — Full professional proficiency

Open source & side projects

YouTube

@atirson-dev

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Welcome to Atirson Dev 💻 Focusing on real technology, real projects, and best development practices. No Pokedex clones or purposeless tutorials — the goal is to go beyond the obvious, creating useful and well-structured content to level up your dev skills.

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