Senior Full-Stack Engineer · Available for freelance

I build SaaS platforms that hold up under real load.

6+ years shipping React, Next.js and Node.js products for teams in the US and Australia — architecture, performance and caching that stays maintainable after the first year.

See selected work Work with me

E2E

features owned, schema → ship

apps live: App Store & Play

years remote

countries · BR·US·AU·PL

Selected work

            FLAGSHIPLIVE ON APP STORE
          

EasyGame

Founder & sole engineer

A complete platform for organizing and running university sports tournaments — built from zero: backend, web app, and native mobile apps.

→Multi-tenant architecture for many tournaments and organizations on one platform
→Native mobile app (React Native / Expo) for participants and spectators
→Shipped to the App Store & Google Play — through 5 iOS review rounds to live

Node.js TypeScript Next.js React Native Expo

IMAGE PLACEHOLDER

Screens of the organizer dashboard & mobile app go here

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IMAGE PLACEHOLDER

Catalog & creator profile screens go here

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CLIENT PROJECT

Printheim

Client project · frontend & design system

A marketplace where 3D artists publish and sell printable models — miniatures, props and decor.

→Creator profiles with stats, bio and a filterable catalog
→Faceted filtering and a dense product grid on a consistent dark theme

React TypeScript Next.js

About

I work across the whole stack, and I go deep where products break.

My focus is the parts that fail when a product grows: caching strategies, query performance, build pipelines, and architecture that stays maintainable after the first year.

I also build and ship my own products end to end — from database schema to the App Store review process. Fully remote from Paraná, Brazil.

Experience

2023 — 2025

Clientbook · Software Engineer

Retail CRM · Utah, USA (remote)

·Led core CRM modules (Reports, Appointments, Client Page) from design to delivery
·Caching & DB optimizations that cut large-report load times by over 80%
·Refactored the build pipeline, reducing build time from 20s to 2s

React · Node · MySQL · AWS

2025

Northflow.io · Software Engineer

Workflow platform · Texas, USA (remote)

·Built the Kanban board, task management and a dynamic form module
·Restructured GraphQL queries/resolvers in the Nest.js backend for speed & reliability

Nest · GraphQL · Prisma · Postgres

2022 — 2023

Jet Brackets · Frontend Engineer

E-learning platform · Texas, USA (remote)

·Owned key React features from implementation to production
·Built SSO auth flows and reporting/admin dashboards

React · Next · Nest · GraphQL

2021 — 2022

uPaged · Software Engineer

Healthcare workforce marketplace · NSW, Australia (remote)

·Built web & mobile apps across frontend and backend for a consistent cross-platform experience
·Implemented backend APIs and marketplace flows in Node.js, Express & MongoDB — data models and endpoints
·Helped migrate the mobile app to React Native, shaping architecture and component strategy
·Owned high-priority bug fixes and stability work, cutting production incidents

React · React Native · Node · MongoDB

Stack

FRONTEND

React · Next.js · React Native
Vite · Tailwind · Storybook

BACKEND

Node.js · Nest.js · Express
GraphQL · Prisma · REST

DATA

PostgreSQL · MySQL · MongoDB

INFRA

AWS (S3, SQS, ElastiCache)
Docker · CI/CD

INTEGRATIONS

Stripe · Firebase
OpenAI · Claude API

EDUCATION & LANGUAGES

Mech. Eng., UNIOESTE (2010–2018)
English (pro) · Português (native)

Contact · Available for freelance

Let's build something that holds up.

Open to freelance and contract work with global teams. Tell me what you're building — I usually reply within a day.

gabriel@barreto.dev Download CV ↓ LinkedIn GitHub

        Gabriel Barreto de Oliveira
        Paraná, Brazil · Working worldwide, remote
        © 2026
      