Senior Full-Stack Engineer
React.js, Node.js, TypeScript, APIs, and reliable production systems.
I'm Gabriel Fernandez, a Senior Full-Stack Engineer with 17+ years of experience building web applications and APIs with TypeScript, React.js, Next.js, Node.js, and NestJS.
Most of my recent work has been end-to-end product engineering for e-commerce and SaaS teams: shipping features, building integrations, improving reliability, mentoring developers, and supporting production systems that need to hold up under real operations.
Toronto, Canada
Open to strong full-time opportunities and selective consulting.
About
I build product systems that stay understandable and dependable as they grow.
My focus is modern full-stack product work with React.js, Node.js, TypeScript, and APIs. I work across frontend, backend, and delivery concerns, and I care about clear architecture, maintainable code, and shipping software that teams can safely build on.
In practice that means shaping solutions with product and design, implementing features, improving integration boundaries, writing and reviewing code carefully, and supporting production after release.
The kinds of systems I've built include:
- Web applications and APIs: Product features and backend services for day-to-day business workflows.
- Integrations and operational tooling: Webhooks, background jobs, retries, and API integrations that keep systems dependable.
- E-commerce and internal systems: Storefronts, admin tools, inventory workflows, and operational platforms.
Teams usually rely on me for:
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End-to-end ownership from discovery through production delivery
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Reliable systems work around APIs, queues, retries, and operational workflows
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Clear communication, strong code review, and mentoring support for other developers
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Additional experience with React Native when a product needs mobile support
Selected work
Recent systems and product work
A few examples that show React, Node.js, APIs, integrations, and reliable delivery in real operating environments.
Valor Distributions
Led development across a Shopify storefront and the supporting product systems behind it. The work combined React-based product delivery, Node.js services, and operational tooling that helped the team ship and support commerce workflows with more confidence.
Owned production work across storefront features, backend integrations, and internal tooling.
Built around Shopify APIs, webhooks, queues, and retries to support dependable operational workflows.
Kept release safety, code quality, and production support in view while shipping features.
React
Node.js
Shopify
APIs
Webhooks
Background Jobs
NextERP
Built ERP workflows for inventory, sales, assembly, and reporting, plus the API integrations that connected operational systems to Shopify and Dear Inventory. The focus was fast internal workflows, clean data movement, and dependable day-to-day use.
Delivered backend and integration work around operational workflows used by internal teams.
Improved system behavior on PostgreSQL-backed inventory and reporting flows.
Supported a responsive product experience designed for fast, accurate internal operations.
Vue.js
PostgreSQL
REST API
Redis
Shopify Integration
ERP Workflows
Stlth Vape Store
Contributed to a live commerce storefront and supporting backend workflows with React, Node.js, and platform integrations. The work centered on shipping dependable production changes around APIs, webhooks, and operational fixes in a busy e-commerce environment.
Delivered frontend and backend improvements in a production commerce environment.
Worked on integrations and operational fixes tied to Shopify APIs and webhook flows.
Balanced release safety, maintainability, and performance while shipping live changes.
Shopify
React
Node.js
API Integration
Webhooks
Production Support
How I work
What teams can expect from me
I fit best where product delivery, engineering quality, and operational reliability all matter.
End-to-end ownership
I work across discovery, implementation, release, and production support rather than treating delivery as only frontend or only backend work.
Reliable product systems
I pay close attention to integration boundaries, operational workflows, tests, safe releases, and the kinds of production details that reduce surprises later.
API and integration depth
A lot of my strongest work sits where products meet external systems: APIs, webhooks, background jobs, retries, and the internal tools that keep operations moving.
Steady collaboration
I like working closely with product, design, and other engineers, and I bring a calm review style with mentoring support when teams need senior guidance.
Core technologies
Technologies I use most for product engineering and backend delivery
The stack below reflects the tools I use most often for React, Node.js, API, and operational systems work.
Get in touch
Hiring for a senior React/Node engineer?
If you're hiring for a senior full-stack role or need help with a strong-fit consulting project, I'd be glad to connect. Recruiters, hiring managers, and product teams are all welcome to reach out.
contact.me.gabriel.fernandez@gmail.com
+1 647 563 9688
You can also find me here: