Senior / Staff Frontend Engineer
Ten years building and scaling products end to end. React, Next.js and TypeScript on platforms serving tens of thousands of live listings, with ownership of the architecture, design systems, monorepos and build tooling that hold them together.
Belo Horizonte, Brazil · Open to remoteReach
Six consumer products across travel, design tools, payments, streaming, education and e-commerce.
Side projects
Investment research for Brazilian equities. Live quotes and charts for every B3 ticker, Graham analysis, portfolio import from broker statements, and a layered cache with a circuit breaker that keeps the app fast when the shared cache is unreachable.
The design system this page is built from. Three-tier tokens, five palettes, an unbundled RSC-safe build, stories that run as tests in a real browser with axe at error level, and gates for chart isolation and bundle budgets.
Experience
Authored the North Star frontend architecture blueprint adopted by the engineering team. Led a Gulp to Webpack migration that cut build times for every frontend engineer. Main point of contact for frontend code standards.
React · Next.js · TypeScript · GraphQL
Architected an Nx monorepo from the first commit: Next.js webapp, backoffice and NestJS API alongside shared UI, types and config libraries. Multi-agent workflows, and vector search backing RAG pipelines.
Nx · NestJS · LangGraph · Pinecone · Stripe
Authored 19 React and React Native courses on one of Brazil's largest tech-education platforms, including a complete Redux ecosystem track.
React Native · Redux · RTK Query · Socket.IO
Co-built the canvas-based real-time editor used by millions, and a multi-user collaboration service on Socket.IO and Redis.
TypeScript · Node.js · Socket.IO · Redis
Key engineer on a backoffice platform handling payments across six interconnected services, contributing to the shared React design system behind them.
React · Storybook · Micro-frontends · Cypress
Architected and led an eight-person frontend team on an insurance platform, delivering a one-year scope in three months. Also shipped features on Globoplay.
React · Redux Saga · styled-components
Earlier: W2Bit, TemboSocial, Best2Bee, and the National Laboratory for Scientific Computing. Full history in the CV.
Speaking and teaching
Courses
Written and recorded for one of Brazil's largest technology-education platforms, in Portuguese. Four tracks, sequenced so each builds on the one before it.
The entry path: how React actually works, then routing, static assets, performance and testing.
Six courses that take state from Context through Redux Toolkit, Immer, and every middleware model in turn: Thunk, Saga and Listener.
The Redux track rebuilt for mobile, plus async caching with RTK Query.
Event-driven React over websockets, the most recent of the set.
Design system
Every surface, control and token on this page comes from @lfrprazeres/ui. The palette control in the corner is not a mock-up of theming, it is the theming. What is harder to see from the outside is how it is held together.