Remote Global Experience
Shipping production software remotely for companies in the United States, Australia and Brazil, working async-first with distributed product, design, backend and QA teams across time zones.
Available to start immediatelySão Paulo, Brazil · Remote
Cesar Fonseca - Full Stack Engineer
Full Stack EngineerTypeScript · React · Node.js
Full Stack Engineer with 7+ years of experience building scalable, high-performance web applications with TypeScript, React and Node.js, across enterprise, fintech, insurance and high-traffic e-commerce.
Core stack:TypeScriptReactNode.jsRemixGraphQL
Cesar Fonseca
Full Stack Engineer
Highlights
What I bring to a team, at a glance, before you dive into the details.
End-to-End Delivery
TypeScript, React, Remix and Node.js, REST and GraphQL APIs, microservices, plus Google Cloud, AWS and Cloudflare. Owning features from technical design to deployment and monitoring.
Web Quality
Performance and Core Web Vitals, SEO, accessibility and server-side rendering, backed by automated tests with Jest and Testing Library and reusable components documented in Storybook.
AI-Assisted Development
An early adopter for 3+ years: ChatGPT, Cursor and Claude in the daily workflow to speed up implementation, refactoring, test writing, debugging and documentation, 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, high-performance web applications with TypeScript, React and Node.js. I enjoy roles where solid engineering and real product impact go hand in hand.
My experience spans very different environments: high-traffic e-commerce at Form Factory, io.insure at Fusion Specialty (the first online M&A insurance marketplace, which I co-created), a microservices core platform at Dock, and mission-critical enterprise systems at IBM.
I've used AI-assisted development daily for over three years. For me, AI is a force multiplier: it helps me ship faster, refactor with confidence, write tests and debug complex issues, while I stay responsible for architecture, code quality and careful review of everything that goes to production.
- 7+ years building web applications
- Remote with US, Australian & Brazilian teams
- TypeScript, React & Node.js
- APIs, microservices & cloud
- Performance, SEO & accessibility
- AI-assisted development (3+ years)
7+
Years experience
Building scalable, high-performance web applications.
4
Companies
Enterprise, fintech, insurance and e-commerce.
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.
Front + Back
Full stack
React, Remix, Node.js, REST and GraphQL.
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
High-traffic, server-rendered web applications with React, Remix and TypeScript (Shopify Hydrogen) for brands such as Chubbies.
Responsibilities
- Developed high-traffic web applications with React, Remix and TypeScript (Shopify Hydrogen), focusing on performance, scalability and maintainability.
- Built server-rendered frontend applications emphasizing SEO, accessibility, Core Web Vitals and user experience.
- Integrated and maintained multiple third-party services through REST and GraphQL APIs, covering search, personalization, reviews, email marketing and analytics.
- 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
- Built Chubbies' high-traffic, server-rendered web application, integrating eight third-party services for search, reviews, loyalty, returns, marketing and analytics.
- Identified and resolved performance bottlenecks and production issues, improving stability and reliability.
- Owned features end to end: technical design, implementation, testing, deployment and monitoring.
- React
- Remix
- TypeScript
- Shopify Hydrogen
- GraphQL
- REST APIs
- SSR
- Core Web Vitals
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.
Frontend
Component architecture, rendering strategies and design systems.
- React
- Remix
- Next.js
- Vue
- TailwindCSS
- SCSS
- Storybook
- Design Systems
Backend
APIs, microservices and system integration.
- Node.js
- REST APIs
- Microservices
- Automation scripts
Languages
Strictly typed, modern JavaScript everywhere.
- TypeScript
- JavaScript
- GraphQL
- HTML5 & CSS3
E-commerce
Headless Shopify and the platforms around it.
- Shopify Hydrogen
- Storefront API
- Pack Digital
- Constructor
- Yotpo
- Rivo
- Loop Returns
- Klaviyo
- Segment
- Elevar
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.