Júlio Carneiro
About
I started building for the web in 2009, at Folha de S.Paulo. Fifteen years have passed, several companies, some failures, and many products that reached millions of people.
My Graphic Design degree and years of 3D modeling changed how I look at the screen — not as a canvas of components, but as a visual space with intent. That lens is what makes my collaboration with UX/UI teams different.
Along the way, I architected frontends that directly impacted revenue across Latin America, achieved 100/100 PageSpeed on Mitsubishi's website, delivered 100% test coverage at Munchies, and built Web3 platforms from scratch.
Experience
Senior Frontend Engineer
Led the frontend architecture evolution with Next.js, React, and TypeScript. Built a real-time collaborative editing platform with LiveBlocks and Tiptap, and a Headless CMS that gave the Marketing team full autonomy. Achieved 100/100 Google PageSpeed on strategic pages. Delivered React Native mobile apps for real-time voice transcription and AI-powered medical assistance.
Frontend Engineer (Web3)
Designed the frontend architecture for a Web3 platform using Wagmi and Ethers.js for smart contract interactions. Achieved 100% test coverage with Jest and React Testing Library. Optimized data efficiency with GraphQL and Apollo integrations.
Senior Frontend Engineer
Maintained and evolved critical conversion flows — Checkout, Cart, Client Area, and Chat — directly impacting revenue across Latin America.
Front-end Engineer
Architected the new Mitsubishi Motors Brazil website focused on performance and SEO. Built a Chrome extension to compare PageSpeed results between development and master environments.
Front-end Engineer
Built the static website and help center blog with Gatsby, ensuring high performance and SEO. Developed new features for the Lapag/Gal system with Meteor, React, and Styled Components.
React Developer
Responsible for the architecture of a scalable system for Porto Seguro, using React, Redux, and Firebase.
Fullstack Developer
Developed mobile apps for sports events in React Native, full-stack websites, and landing pages for clients including Sprinta and Betafly.
Front-end Developer & Webmaster
Eight years across Folha de S.Paulo (Webmaster), ClickBus (Landing Pages), Urban Summer (campaigns for Itaú, Abril, Audi), Gauge (Analytics for VIVO), and Itelios (VTEX/Magento e-commerce).
Skills
Education
Jan 2025 — Jan 2027
Graphic Design
Universidade Anhembi Morumbi
Jan 2022 — Jan 2024
Cybersecurity Technology
FIAP
Certifications
- —CSIRT Foundation
- —Linux Essentials (401)
- —Linux System Administration (402)
- —Cybersecurity & Ethical Hacking
- —Cybersecurity Fundamentals (CISCO)