Hi, I'm
Lucas Medeiros
Senior Frontend Engineer
I build high-performance web applications with React & TypeScript for international teams.
Belo Horizonte, Brazil
About me
I'm a Senior Frontend Engineer based in Belo Horizonte, Brazil, with over 8 years of experience building web applications for companies across the US, Europe, and Latin America.
I specialize in React and TypeScript, with a strong focus on performance optimization, design systems, and frontend architecture. I've led migrations from legacy frameworks, built testing infrastructures from scratch, and mentored engineers — all while staying hands-on with feature delivery.
I've been working remotely with international teams for years, and I thrive in async-first, distributed environments. I care about shipping quality work, making thoughtful technical decisions, and building systems that scale.
Currently, I'm exploring advanced React patterns, AI-assisted development workflows, and contributing to the frontend community.
Technical expertise
Frontend & Architecture
React, TypeScript, Next.js, Remix
UI & Design Systems
TailwindCSS, Radix UI, Material UI, Storybook, WCAG
State & Data
Redux, Jotai, REST APIs, GraphQL
Testing & Quality
Jest, Vitest, Playwright, React Testing Library
DevOps & Observability
CI/CD, Docker, AWS, Lighthouse, Datadog, Sentry
Experience
8+ years building for companies across the US, Europe, and Latin America.
Senior Frontend Engineer
Somewhere LLC (Refersion)2025
Rebuilt core merchant experience for 600K+ orders/day affiliate platform
Senior Frontend Engineer
Grupo Montreal (IPSEMG)2025
Led frontend for mission-critical healthcare platform serving 2,000+ companies
Senior Frontend Engineer
Growin / CGI2024
Built testing strategy for enterprise e-commerce platform (0→90% coverage)
Senior Frontend Engineer
Avenue Code Portugal (Emma)2024
Led Vue 2 → React/Next.js migration, built design system from scratch
Frontend Engineer
Aubay Portugal (Mindera)2022–2024
Performance optimization for 2,000+ store e-commerce (Lighthouse 30→78)
Frontend Engineer
Inter2021–2022
PIX payment integration and design system standards
Frontend Developer
Rock Content2020–2021
Co-architected greenfield SaaS platform supporting 3 markets
Frontend Developer
Dito CRM, Avenue Code, TaskInternet2013–2020
Dashboards, sales funnels, internal products, and CMS development
Featured work
Affiliate Platform Rebuild
Rebuilt core merchant experience for a 600K+ orders/day affiliate platform, improving performance and developer velocity.
Healthcare Platform
Led frontend for mission-critical healthcare platform serving 2,000+ companies with real-time data processing.
Enterprise E-commerce
Built testing strategy and performance optimization for 2,000+ store e-commerce platform (Lighthouse 30→78).
Projects
BoardGame BH
Community platform for board game enthusiasts in Belo Horizonte, helping players find events, groups, and game sessions.
Zac Esquilo
A fun browser-based game featuring Zac the squirrel, built as a side project to explore game development with web technologies.
What people say
“Lucas is a very strong developer, that joined the team when it was forming, and very quickly provided lots of impact and results. His attention to execution and ideas were often not just praised by the team, but objectively valuable in generating better codebase and better functionalities. Particularly his drive in a huge frontend revamp played a fundamental role in meeting deadlines and even forecasting to stakeholders.”
“I'm glad to recommend Lucas. He is an exceptional Frontend Developer and I've had a chance to work with him alongside. What sets Lucas apart is not just his technical prowess but also his outstanding communication skills and his willingness to assist teammates. He is proactive, taking the participation in team forming questions, takes the initiative, support teammates in challenging situations. In summary, Lucas is a highly skilled and dedicated developer and you will be fortunate enough to have him.”