Lucas Cardoso Medeiros

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Senior Frontend Engineer

Somewhere, Refersion

Aug 2025 - Jan 2026 (6 months)

Worked on a US-based affiliate marketing platform processing 600K+ orders/day, helping e-commerce companies manage and scale their partner programs. The main challenge was improving merchant self-service. They struggled with onboarding, affiliate prospecting, and platform navigation, creating high support volume. • Rebuilt the core merchant experience by redesigning affiliate onboarding and Shopify integration flows, reducing customer support dependency and enabling faster, friction-free setup • Led component architecture strategy by auditing Figma designs, creating a roadmap for implementing 20+ reusable, responsive and accessible components using Tailwind CSS, improving UI consistency • Built an AI-powered affiliate discovery feature fro

Senior Frontend Developer

Montreal Oficial

Mar 2025 - Aug 2025 (6 months)

Short-term contract during my relocation from Portugal to Brazil. Worked on an enterprise e-commerce management platform (500+ users) with complex authentication requirements. • Led frontend testing strategy, establishing testing infrastructure from 0% to 90% coverage (Jest/React Testing Library)—identifying critical bugs pre-deployment and improving release reliability • Built secure authentication flows (WebAuthn, TOTP, Keycloak integration) in close collaboration with backend and DevOps, ensuring enterprise-grade security standards • Improved CI/CD pipeline efficiency by 30% through GitLab optimizations, streamlining release cycles • Acted as senior technical advisor in a small cross-functional team, driving improvements to agile ceremo

Senior Frontend Developer | React at CGI

Growin

Aug 2024 - Dec 2024 (5 months)

Short-term contract during my relocation from Portugal to Brazil. Worked on an enterprise e-commerce management platform (500+ users) with complex authentication requirements. • Led frontend testing strategy, establishing testing infrastructure from 0% to 90% coverage (Jest/React Testing Library)—identifying critical bugs pre-deployment and improving release reliability • Built secure authentication flows (WebAuthn, TOTP, Keycloak integration) in close collaboration with backend and DevOps, ensuring enterprise-grade security standards • Improved CI/CD pipeline efficiency by 30% through GitLab optimizations, streamlining release cycles • Acted as senior technical advisor in a small cross-functional team, driving improvements to agile ceremo

Senior Frontend Developer | React at Emma

Avenue Code, Emma

Feb 2024 - Jul 2024 (6 months)

Worked for a subscription-based e-commerce company focused on personalized sleep products, operating at scale with strong emphasis on performance and user experience. The team was transitioning away from Vue 2 (EOL) and needed to rebuild core parts of the application while establishing modern frontend standards. • Led technical execution of a Vue 2 to React/Next.js migration, rebuilding core modules (navigation, dashboard, home) and improving page load time by 60% leveraging React expertise to accelerate team delivery velocity by 70% • Co-architected frontend technical foundation with another senior engineer, defining standards for TailwindCSS + Radix UI integration, ESLint rules, and project taxonomy • Built a complete design system from

Frontend Developer

Mindera, Aubay Portugal

Feb 2022 - Feb 2024 (2 years 1 month)

Worked on a large-scale international e-commerce platform (2,000+ stores across 8 countries, 1.5M+ products in UK alone) serving high daily traffic across multiple markets. • Delivered high-impact performance optimizations, improving Lighthouse scores from 30 to 78 across critical pages (Home, PLP, PDP)—significantly boosting Google rankings and conversion rates • Led implementation of advanced frontend optimization techniques (lazy loading, code splitting, caching, memoization) as part of a 5-engineer team, reducing bundle size by 60% and dramatically improving Time-to-Interactive • Established comprehensive testing strategy (Vitest, Playwright), achieving 95% test coverage and improving release confidence—enabling the team to ship featur

Frontend Developer

Inter

May 2021 - Jan 2022 (9 months)

Digital banking platform serving millions of users across Brazil. Led frontend refactor of the payment page, integrating PIX payment functionality—enabling millions of users to access Brazil's instant payment system with improved UX and reliability Established design system standards for the internet banking platform, defining reusable component patterns that improved consistency and accelerated feature delivery

Frontend developer

Rock Content

Sep 2020 - Apr 2021 (8 months)

Content marketing SaaS platform with international reach. Co-architected a greenfield multi-language platform (React/TypeScript/AWS) supporting 3 markets (Portuguese, English, Spanish), establishing frontend architecture and development patterns Designed and implemented reusable design system components, significantly reducing bundle size and improving application performance through optimized component architecture

Frontend Developer

Dito CRM

Jun 2019 - Aug 2020 (1 year 3 months)

Marketing automation and CDP platform serving enterprise retail clients. Developed data visualization dashboards for a CDP serving 150M+ consumers across hundreds of retail clients and 10,000+ connected physical/e-commerce stores Modernized legacy JavaScript codebase to ES6 and SCSS alongside 2 engineers, improving mobile responsiveness across 10+ pages and significantly enhancing code maintainability

Frontend Developer

Avenue Code

May 2018 - May 2019 (1 year 1 month)

• Developed responsive and user-friendly web pages using AEM (Adobe) and Vue.js. • Enhanced and updated web pages to improve SEO and API consumption capabilities. • Participated in grooming meetings to analyze and gather requirements, contributing to project planning and execution. • Served as a technical recruiter, conducting 6 technical interviews and evaluating coding challenges. • Involved in internal projects, including the development and maintenance of the company’s website in React, and teaching computer science to children using Code.org.

Software Developer

TaskInternet

Feb 2015 - Jan 2018 (3 years)

• Worked on the development and maintenance of internal web products, focusing on performance, reliability, and usability. • Acted as lead developer on a custom CMS project for client websites, improving content management workflows. • Improved application performance through code optimization and load time reduction. • Mentored interns and collaborated on requirements analysis and project delivery with stakeholders.

Web Developer Internship

TaskInternet

Jan 2013 - Jan 2015 (2 years 1 month)

- Optimized back-end processes of internal systems, streamlining workflows and eliminating the need for intermediate manual processes. - Developed projects and web systems (internal and for clients), including integration with external web services and WordPress blogs. - Created and adjusted web pages, newsletters, and email marketing campaigns, ensuring responsiveness and configuring SEO tags.

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Web Developer Internship

Nuts Design de Ideias

Jan 2012 - Dec 2012 (1 year)

- Developed PHP/MySQL code within HTML pages, ensuring functionality and efficiency. - Styled pages using CSS, creating visually appealing and functional web pages.

Lucas Cardoso Medeiros

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