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Achievement: Public SponsorAchievement: Pair ExtraordinaireAchievement: YOLOAchievement: Pull Sharkx2Achievement: Arctic Code Vault Contributor

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leandroaps/README.md

Leandro Aparecido de Siqueira

Senior Front-End Engineer · React & TypeScript · AI-Assisted Engineering · Technical Lead · 20+ Years of Experience

📍 Campinas, São Paulo, Brazil

Building high-performance web applications with React and TypeScript for over two decades. I combine deep technical expertise with leadership and Agile practices to deliver scalable, accessible, and user-focused solutions for enterprise clients across finance, health, media, and consumer brands.

Currently exploring how AI-assisted engineering (Claude Code, LLM-powered workflows) can amplify developer productivity without sacrificing code quality.

🚀 Highlights

  • ⚡ Led a front-end performance overhaul that boosted application performance by 300% and cut the bundle to less than ¼ of its original size by migrating to Vite
  • ✅ Migrated a legacy test suite to Vitest, reaching 80%+ code coverage
  • 🏦 Delivered enterprise projects for Itaú Unibanco, Brazil's largest private bank, as Technical Lead
  • 🌎 Built consumer-facing sites for Johnson & Johnson brands (Neutrogena, Listerine, ACUVUE) serving millions of US users
  • 👥 Grew from hands-on developer to Technical Lead and Agile Master, mentoring teams and defining front-end architecture

💼 Where I've Worked

Venturus · Itaú Unibanco · UOL · Pravaler · Vitat · 3M · Ci&T (Johnson & Johnson)

🛠 Tech Stack

Frontend

React TypeScript JavaScript Angular HTML5 CSS3 Tailwind CSS Ant Design

Build, Testing & Infrastructure

Vite Webpack Vitest Cypress Docker Kubernetes Jenkins Git

AI-Assisted Engineering

Claude Code GitHub Copilot

Practices & Leadership

Agile Technical Lead CI/CD Accessibility

📊 GitHub Stats

GitHub stats Top languages

🔭 Currently

  • 🏢 Senior Front-End Software Engineer building enterprise-grade applications with React, TypeScript & Ant Design
  • 🤖 Deepening my practice of AI-assisted engineering and developer-productivity tooling
  • ✍️ Writing about front-end and engineering on Medium

🤝 Connect

Portfolio LinkedIn Medium Email

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