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.
Today I work AI-first: I use Claude Code with project-level CLAUDE.md files, custom skills and specialized agents to ship faster without sacrificing code quality — and I open-source those setups in the projects below.
- ⚡ Cut the production bundle by 75%+ and improved LCP from X s to Y s by migrating Webpack → Vite, adding route-level code splitting and removing unused dependencies
- ✅ 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
Venturus · Itaú Unibanco · UOL · Pravaler · Vitat · 3M · Ci&T (Johnson & Johnson)
| Project | What it is | Stack |
|---|---|---|
| sass-next-template | Production-ready SaaS starter with auth, i18n, E2E tests, CI and a Claude Code agent team (frontend, backend, test) | Next.js 16 · TS · Drizzle · Better Auth · Playwright · Cloudflare |
| leandroaps.com.br | My portfolio — SSR, tested, with custom Claude Code skills for content updates | React 19 · React Router 7 · Vite · Vitest · Tailwind 4 |
| react-module-federation | Host/remote micro-frontend example with Module Federation | React · TS · Vite |
| react-zustand-template | Minimal React starter with typed state, persistence and tests | React · TS · Zustand · Vitest |
| midnight-breeze | Dark theme published on the VS Code Marketplace | VS Code · iTerm2 |
Frontend
Build & Testing
AI-Assisted Engineering
Practices & Leadership
➡️ More on Medium
- 🏢 Senior Front-End Software Engineer building enterprise-grade applications with React, TypeScript & Ant Design
- 🤖 Building agentic workflows (Claude Code agents, skills and specs) for front-end teams
- ✍️ Writing a series on AI, Spec-Driven Development and agentic harnesses on Medium
