Remote Global Experience
Shipping production storefronts remotely for companies in the United States, Australia and Brazil, working async-first with distributed teams across time zones.
Available to start immediatelySão Paulo, Brazil · Remote
Cesar Fonseca - Shopify Engineer
Shopify EngineerHydrogen & Headless Commerce
Full Stack Engineer with 7+ years of experience, specializing in TypeScript and headless e-commerce: Shopify Hydrogen and Remix storefronts for brands such as Chubbies.
Core stack:Shopify HydrogenRemixReactTypeScriptGraphQL
Cesar Fonseca
Shopify Engineer
Highlights
What I bring to a team, at a glance, before you dive into the details.
Headless Commerce
Shopify Hydrogen, Remix and the Storefront API, integrated with Pack Digital, Constructor, Rivo, Yotpo, Loop Returns, Klaviyo, Segment and Elevar, for brands such as Chubbies.
Front-End Architecture
Design systems and Storybook, reusable components, performance and Core Web Vitals, SEO and accessibility, keeping every storefront fast and reliable as the business grows.
AI-Assisted Development
An early adopter for 3+ years: ChatGPT, Cursor and Claude in the daily workflow to ship faster, refactor with confidence and debug complex issues, with careful review of everything that ships.
Based in
São Paulo, Brazil · BRT · UTC−3
Overlaps with US Eastern & Central hours
About me
I'm a Full Stack Engineer from São Paulo, Brazil, with 7+ years of experience building scalable web applications, specializing in TypeScript and headless e-commerce.
Most recently at Form Factory, I developed next-generation headless Shopify storefronts with Hydrogen and Remix for brands such as Chubbies, integrating platforms across search, reviews, loyalty, returns, email marketing and analytics: Pack Digital, Constructor, Rivo, Yotpo, Loop Returns, Klaviyo, Segment and Elevar.
My work centers on performance, SEO, accessibility and stability in production, making sure every storefront stays fast and reliable as the business grows. I've also used AI-assisted development daily for over three years to ship faster without compromising code quality.
- 7+ years building web applications
- Remote with US, Australian & Brazilian teams
- Shopify Hydrogen & Remix
- 8+ commerce integrations in production
- Performance, SEO & accessibility
- AI-assisted development (3+ years)
7+
Years experience
Building scalable, high-performance web applications.
8
Integrations
Third-party platforms on a single Hydrogen storefront.
3+
Years AI-assisted
Shipping faster with careful human review.
50+
Delivered features
Owned end to end, from design to monitoring.
US · AU · BR
Remote teams
Distributed teams across time zones.
Hydrogen
Headless commerce
Remix, Storefront API and 8 integrations.
Career
Seven years across enterprise, fintech, insurance and high-traffic e-commerce, remote with teams in the United States, Australia and Brazil.
May 2024 - Sep 2026
01
Period: May 2024 - Sep 2026
Next-generation headless Shopify storefronts with Hydrogen and Remix for brands such as Chubbies.
Responsibilities
- Developed next-generation headless Shopify storefronts using Hydrogen and Remix, focusing on performance, scalability and maintainability.
- Built and maintained high-performance frontend applications with React and TypeScript, emphasizing SEO, accessibility and user experience.
- Integrated and maintained platforms for personalization, search, reviews, returns, email marketing, analytics and tagging.
- Used AI tools (Claude, Cursor, ChatGPT) daily to speed up implementation, refactoring, test writing and debugging.
- Collaborated with cross-functional teams to align technical solutions with product and business requirements.
Key achievements
- Shipped Chubbies' headless storefront integrating Pack Digital, Constructor, Rivo, Yotpo, Loop Returns, Klaviyo, Segment and Elevar.
- Identified and resolved performance bottlenecks and production issues, improving stability and reliability.
- Owned features end to end: technical design, implementation, testing, deployment and monitoring.
- Shopify Hydrogen
- Remix
- React
- TypeScript
- Storefront API
- Pack Digital
- Constructor
- Yotpo
- Klaviyo
- Segment
- Elevar
Jun 2022 - Mar 2024
02
Period: Jun 2022 - Mar 2024
Frontend engineer on io.insure, the online M&A insurance marketplace behind Mio, Fusion Specialty's global M&A insurance product for small and mid-sized businesses.
Responsibilities
- Worked as a senior individual contributor on io.insure and other Fusion Specialty products, maintaining consistent frontend standards and best practices.
- Collaborated daily in an Agile, cross-functional environment with Product, Design, Backend and QA.
- Developed and maintained automated tests using Jest and Testing Library.
Key achievements
- Co-created io.insure, the world's first online M&A insurance marketplace.
- Contributed reusable UI components to the design system and maintained its Storybook documentation.
- Identified, debugged and fixed frontend issues, improving reliability and user experience.
- Frontend
- Design System
- Storybook
- Jest
- Testing Library
- Agile
Dec 2021 - Jun 2022
03
Period: Dec 2021 - Jun 2022
Architected and delivered the company's core platform on a microservices architecture, consolidating products into a centralized dashboard.
Responsibilities
- Worked across backend and frontend layers, collaborating with engineering leadership to align technical solutions with business goals.
- Played a key role in sprint planning, technical decision-making and delivery in an Agile environment.
- Mentored junior developers and interns through code reviews and technical guidance.
Key achievements
- Architected and delivered the core platform on microservices, consolidating multiple products into one centralized dashboard.
- Microservices
- Backend
- Frontend
- Agile
- Mentoring
Jun 2019 - Dec 2021
04
Period: Jun 2019 - Dec 2021
Enterprise-scale applications for infrastructure and system-health monitoring, supporting mission-critical systems with distributed teams.
Responsibilities
- Built and maintained enterprise-scale applications for infrastructure and system health monitoring.
- Applied testing strategies and clean code principles to ensure long-term maintainability.
- Supported mission-critical systems with distributed teams following Agile and enterprise engineering standards.
Key achievements
- Developed a critical dashboard to monitor IBM machines globally, improving operational efficiency.
- Created automation scripts that reduced manual workflows.
- Dashboards
- Monitoring
- Automation scripts
- Testing
- Agile
Education
- 2023Postgraduate Degree, IT Management and GovernanceSenac
- 2020 - 2021Bachelor of Technology, Systems Analysis and DevelopmentUniversidade Paulista (UNIP)
- 2017 - 2021Bachelor's Degree, Industrial EngineeringFaculdade Santa Lucia
What I've built
Products and platforms I've designed and built inside teams, from storefronts to the architecture underneath them.
Form Factory · ApparelChubbies
Headless Shopify storefront for Chubbies, the menswear brand known for proper length shorts. Built with Hydrogen and Pack Digital, deployed on Oxygen, with eight third-party services integrated.
- High-traffic, server-rendered for SEO and Core Web Vitals
- Search, reviews, loyalty, returns, email and analytics integrated
- Features owned end to end, from technical design to monitoring
- Shopify Hydrogen
- Oxygen
- Pack Digital
- Remix
- TypeScript
- Constructor
- Yotpo
- Klaviyo
Form Factory · GamingTurtle Beach
Headless Shopify storefront for Turtle Beach, the gaming headsets, controllers and simulation gear brand. Built with Hydrogen, deployed on Oxygen, with content managed in Builder.io.
- Large catalog across headsets, controllers and accessories
- Editorial content managed in Builder.io
- Performance, SEO and accessibility in production
- Shopify Hydrogen
- Oxygen
- Builder.io
- React
- TypeScript
Form Factory · OutdoorISLE Surf & SUP
Headless Shopify storefront for ISLE, the paddle board brand with more than 20 years on the water. Built with Hydrogen and Remix, deployed on Oxygen.
- Product discovery for paddle boards and gear
- Server-rendered storefront on the edge
- Performance, SEO and accessibility in production
- Shopify Hydrogen
- Oxygen
- Remix
- React
- TypeScript
Personal project · MusicPonto Cego
Landing page for Ponto Cego, a melodic hardcore band from Mogi Guaçu (SP), built for the launch of its first single, Náufrago. I translated the band's idea and the essence of the song and its artwork into the site: visual identity, copy, single release, videos, band story, members and booking contact.
- Band concept, song and single artwork translated into the site's visual identity
- Single launch with streaming links, videos, band story and member profiles
- Booking contact form, social sharing previews and fast static pages
- Next.js
- React
- Vercel
- Art Direction
- SEO
Off the clock, I'm the band's bass player.
Visit sitepontocegorock.com.br
Fusion Specialty · Insurtechio.insure
The world's first online M&A insurance marketplace, co-created while at Fusion Specialty. It powers Mio, a global M&A insurance product for buyers and sellers of small and mid-sized businesses.
- World-first online M&A insurance marketplace
- From terms to a bound policy online
- Consistent frontend standards across products
- Marketplace
- Insurtech
- M&A
- Design System
- Jest
Form Factory · PlatformCommerce Integrations
Search, reviews, loyalty, returns, email marketing, analytics and tagging wired into headless storefronts through REST and GraphQL, without hurting performance.
- Personalization and search with Constructor
- Reviews, loyalty and returns in the purchase flow
- Consistent analytics with Segment and Elevar
- Pack Digital
- Constructor
- Rivo
- Yotpo
- Loop Returns
- Klaviyo
- Segment
- Elevar
Fusion Specialty · io.insureDesign System & Storybook
Reusable UI components and Storybook documentation that kept frontend standards consistent across io.insure and other Fusion Specialty products.
- Shared components across products
- Documented in Storybook for design and engineering
- Covered by automated tests
- Design System
- Storybook
- Jest
- Testing Library
Dock · FintechCore Platform on Microservices
Architected and delivered the company's core platform on a microservices architecture, consolidating multiple products into one centralized dashboard.
- Products consolidated into a single dashboard
- Backend and frontend delivered together
- Junior developers mentored through reviews
- Microservices
- Backend
- Frontend
- Dashboard
IBM · EnterpriseGlobal Machine Monitoring
A critical dashboard to monitor IBM machines globally, plus enterprise applications for infrastructure and system health monitoring.
- Improved operational efficiency worldwide
- Automation scripts replaced manual workflows
- Mission-critical systems kept healthy
- Dashboards
- Monitoring
- Automation scripts
Technical skills
A modern, type-safe stack, chosen for performance, maintainability and delivery speed.
E-commerce
Headless Shopify and the platforms around it.
- Shopify Hydrogen
- Storefront API
- Pack Digital
- Constructor
- Yotpo
- Rivo
- Loop Returns
- Klaviyo
- Segment
- Elevar
Frontend
Component architecture, rendering strategies and design systems.
- React
- Remix
- Next.js
- Vue
- TailwindCSS
- SCSS
- Storybook
- Design Systems
Languages
Strictly typed, modern JavaScript everywhere.
- TypeScript
- JavaScript
- GraphQL
- HTML5 & CSS3
Backend
APIs, microservices and system integration.
- Node.js
- REST APIs
- Microservices
- Automation scripts
Cloud & DevOps
Deployment, CI/CD and monitoring.
- Google Cloud
- AWS
- Cloudflare
- Vercel
- CI/CD
Web Quality & Testing
Fast, accessible, discoverable and tested.
- Web Performance · CWV
- SEO
- Accessibility (a11y)
- Jest
- Testing Library
AI Tools
AI-assisted coding, review, tests and debugging.
- Claude
- ChatGPT
- Cursor
Tools
The daily toolbox for fast, reliable delivery.
- Git
- GitHub
- VS Code
- Docker
- npm
- Yarn
- Bun
Tech stack
The tools I reach for every day, orbiting the core: React, TypeScript, Node.js and Shopify.
- React
- TypeScript
- Shopify
- Node.js
- Remix
- GraphQL
- Tailwind CSS
- Storybook
- Cloudflare
- Next.js
- Vercel
- GitHub
- Google Cloud
- VS Code
- Framer Motion
For recruiters
Two tailored versions of the same career: pick the one that matches the role.
Every document is available in English (original) and Brazilian Portuguese.
Elsewhere
GitHub
@cesuain
- Contributions
- 979
- Repositories
- 4
- Followers
- 7
- On GitHub since
- 2019
Contribution activity
Most of my work at IBM, Dock and io.insure was done through company organization accounts, so those contributions don't show up here.
Recently active in
- Fork of vercel/turborepo
turborepo
Build system optimized for JavaScript and TypeScript, written in Rust
- Fork of remix-run/react-router
react-router
Declarative routing for React
- Fork of Shopify/hydrogen
hydrogen
Hydrogen lets you build faster headless storefronts in less time, on Shopify.
- Fork of shadcn-ui/ui
ui
Composable, accessible components with thoughtful defaults. Build your own component library with code you can customize, extend, and make your own.
in/cesarfonsecadev
Full Stack Engineer · Shopify Hydrogen & Headless Commerce · TypeScript, React, Node.js · AI-Assisted Development
Open to
- Full Stack Engineer
- Shopify Engineer
- Frontend Engineer
- Location
- São Paulo, Brazil
- Local time
- --:-- (BRT · UTC−3)
- Availability
- Available to start immediately
Contact
Hiring for a full stack or Shopify role? I'd love to hear about your team and product.
Send a message
I usually reply within one business day.