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Joao Melo

@joaomelo

Message

Frontend Engineer building high-performance React/Next.js web interfaces for global brands.

Brazil

Message

What I'm looking for

I want to build high-performance React/Next.js interfaces at global scale—handling data-driven logic, localization, and performance budgets—while collaborating in Agile/Scrum with strong engineering standards (code reviews, version control, and measurable outcomes).

I’m a Frontend Engineer with 4 years of experience building high-performance web interfaces with React, Next.js, and TypeScript. I’m energized by turning complex requirements into fast, reliable UI—especially where localization, personalization, and data-driven logic matter.

In AdTech and Creative Automation, I scaled global DCO campaigns across 15+ countries, implementing a manifest-driven logic architecture and improving performance to achieve sub-1s load times. I combined Vanilla JavaScript engines with React + Vite to keep interactive ads fast while using a reusable component library.

At Valtech, I grew from working in the Sitecore CMS ecosystem to delivering Next.js and Headless solutions. I built a Smart Component quiz for Maybelline that increased engagement by 25% during launch, and I helped migrate and refactor global experiences for Mandarin Oriental Hotels with localization, performance optimization, and Core Web Vitals in mind.

I bring strong collaboration habits through Agile/Scrum, Jira, strict version control, and thoughtful code reviews. My approach blends performance engineering (code-splitting, lazy loading, font subsetting) with maintainable frontend architecture—so teams can ship global-quality experiences confidently.

Experience

Work history, roles, and key accomplishments

Frontend Engineer

Innovid

Jun 2025 - Apr 2026 (10 months)

Scaled global DCO campaigns across 15+ countries using a manifest-driven architecture, achieving sub-1s load times and 300KB K-weight limits. Built a hybrid Vanilla JS/React (Vite) system with code-splitting and font subsetting, and delivered 100% visual integrity across multi-language grids and animated feeds using GSAP.

React Vite Vanilla.JS Font Subsetting Agile Scrum

Frontend Engineer

Valtech

Mar 2022 - Mar 2025 (3 years)

Delivered Sitecore-focused frontends and later specialized in Next.js headless architectures, including a Smart Component quiz for Maybelline that increased user engagement by 25% during launch. Refactored and migrated Mandarin Oriental Hotels global sites to improve performance and localization for 20+ international markets, earning a 'Valtech Star' award 3x in a row.

React Next.js TypeScript Sitecore Layout Service API Context API Code Splitting Lazy Loading Sitecore Jss