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Fernanda Querino

@fernandaquerino

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Senior Front-End Engineer specializing in React, TypeScript, Next.js for scalable products.

Brazil

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What I'm looking for

I’m looking for a product-focused team where I can lead scalable front-end architecture with React/Next.js, strengthen CI/CD and observability, and mentor engineers—while partnering with Product, UX, and Back-End to deliver measurable business impact.

I’m a Senior Front-End Engineer with 10 years of experience building scalable web applications in high-traffic e-commerce and fintech environments. I specialize in React, TypeScript, and Next.js, and I’ve driven measurable improvements—including a 52% reduction in page load time through a full SPA migration.

I focus on building maintainable front-end architecture, BFF layers, and accessible component libraries—while using observability (New Relic, performance monitoring, Core Web Vitals) to make faster, smarter decisions. Across roles, I’ve led code review and technical direction, mentored engineers, and partnered closely with Product, UX, and Back-End teams from discovery through delivery.

Experience

Work history, roles, and key accomplishments

Senior Front-End Engineer

Grupo Boticário

May 2023 - Oct 2025 (2 years 5 months)

Developed and evolved external and internal financial platforms, improving usability, stability, and operational efficiency. Built BFF layers with Next.js, implemented observability with New Relic, led front-end reviews and architecture standards, and contributed to a full SPA migration that reduced page load time by 52%.

React TypeScript Next.js New Relic Observability GitHub Actions Jest React Testing Library WCAG Accessibility

Lead Front-End Developer

JBQ.Global

Aug 2021 - Jan 2023 (1 year 5 months)

Led front-end delivery for two large-scale B2B and B2C e-commerce platforms and managed a team of 7 engineers. Defined front-end architecture and standards across projects, mentored 6 engineers (with 2 promoted to senior), and served as technical point of contact translating requirements into delivery estimates.

React TypeScript Mentoring Stakeholder Management Performance Optimization Accessibility Testing

Senior Front-End Developer

Mambo

Jun 2020 - Jul 2021 (1 year 1 month)

Architected and delivered a full front-end redesign for an e-commerce platform, driving a significant conversion-rate improvement. Implemented an omnichannel loyalty program with catalog-wide pricing logic and production rollout across physical stores and e-commerce.

React Front End Design Component Design Performance Optimization JavaScript Testing

Front-End Developer

Driven.CX

Apr 2017 - Jun 2020 (3 years 2 months)

Migrated a multi-page application to a React SPA, cutting page load time by 52% and improving the shopping experience under high daily traffic. Built checkout redesigns and payment integrations, implemented WCAG-compliant marketing landing pages, reduced technical debt, and resolved production bugs to protect revenue.

React SPA Migration TypeScript Payment Integration WCAG Accessibility Responsive UI Performance Optimization Jest