Gabriel Santos Cardoso

Software Engineer — Backend, Blockchain & Cloud

Barcarena, Pará, Brazil · +55 91 99213-0338 · eng.gabrielscardoso@gmail.com

Summary

Software Engineer with 5+ years building production systems for blockchain, fintech, telecommunications and cybersecurity companies. I work end to end — from architecture and backend services in Go, Node.js, PHP and Java to frontends in Vue, React and Angular — and have led product modules as both engineer and Product Owner. Used to distributed, multicultural and asynchronous teams, with a strong focus on security, automated testing and CI/CD.

Core Skills

Languages: Go, TypeScript, PHP, Python, Java (17–23), Solidity, Rust

Backend: Gin, Fiber, NestJS, Node.js, Laravel, Symfony, Spring, Flask, RabbitMQ

Frontend: Vue / Nuxt, React / Next.js, Angular, TailwindCSS, Pinia, Zustand, Vite

Blockchain: Hyperledger Fabric, Besu, Cacti, Paladin, Ethereum, Foundry, Hardhat, ZKP

Data: PostgreSQL, MySQL, MariaDB, SQLite, MongoDB, Redis, Prisma, Sequelize

Cloud & DevOps: AWS, GCP, Docker, Docker Swarm, Terraform, NGINX, GitHub Actions, CI/CD

Practices: Scrum, Kanban, XP, Clean Code, unit / integration / E2E testing (Jest, Pest, PHPUnit, Playwright), technical leadership

Experience

Blockchain Developer — GoLedger

Aug 2025 – Present

Build decentralised systems on Hyperledger Fabric and Besu, from network architecture through to production deployment.
Delivered the Sustainability Articles Platform for Caixa Econômica Federal, connecting on-chain records to Pix payments to fund environmental initiatives.
Built digital identity and biometric document-control systems, plus Zero-Knowledge Proof pilots for privacy-preserving verification.
Ongoing involvement in monitoring and maintenance of internal projects.

Stack: Go, Node.js, React, PostgreSQL, Hyperledger Fabric, Besu, Foundry, Hardhat, ZKP

Data Developer — Indico

Jun 2025 – Present

Deliver end-to-end solutions for global brands including Lindt, Galderma, JSL and Ancar, from technical specification to release.
Build and maintain APIs and applications with Go (Fiber), Python (Flask) and Angular frontends.
Design and operate loyalty ecosystems, using advanced SQL analysis on PostgreSQL, MySQL and other databases to support product and business decisions.
Integrate strategic partner platforms and run secure, scalable workloads on Google Cloud Platform for web and mobile products.

Stack: Go, Fiber, Python, Flask, Angular, TailwindCSS, Material UI, GCP, PostgreSQL, MySQL, SQL Server

Full Stack Developer — Merchion

Mar 2025 – Aug 2025

Modernised legacy infrastructure into scalable microservices architectures for clients such as Perto and Zuki.
Delivered full-stack features across Angular, Next.js and Nuxt on the frontend and Go, Java (Spring Boot) and NestJS on the backend.
Operated containerised environments with Docker Swarm, NGINX and RabbitMQ, and deployed event-driven, serverless workloads on AWS.
Established testing, documentation and compliance standards that improved product quality and shortened onboarding.

Stack: Go, Java, Spring Boot, NestJS, Angular, Next.js, Nuxt, Docker Swarm, RabbitMQ, AWS, PostgreSQL, Redis

Full Stack Developer — Fone Ninja

May 2024 – Apr 2025

Owned the Technical Assistance module as engineer and Product Owner, leading technical decisions and discovery with clients and stakeholders.
Shipped work-order improvements, per-store service management, electronic checklists and a configurable Kanban board for visual tracking.
Built the payments and subscriptions module with Stripe, enabling fully customisable subscription plans.
Refactored UI/UX and performance of core pages (Sales, Purchases, Products, Dashboard) and integrated PlugSign, ClickUp and CMS tools.

Stack: Vue.js, Pinia, Vite, PrimeVue, TailwindCSS, Laravel, PHP, MySQL, Redis, Docker, NGINX, AWS

Full Stack Developer — DefSafe

Mar 2024 – May 2024

Implemented social authentication with AWS Cognito and OIDC providers (Google, LinkedIn, Microsoft Azure).
Built corporate Single Sign-On over SAML, integrating Google Workspace and Microsoft Entra ID to meet enterprise security and compliance requirements.
Improved core application performance by tuning Pinia state management and Nuxt rendering modes, working alongside QA on stability.

Stack: Vue.js, Nuxt, Nitro, Pinia, TypeScript, Prisma, Supabase, PostgreSQL, AWS (Cognito, Lambda, SES, Amplify)

Full Stack Developer — Dacxi Chain

Jan 2023 – Apr 2024

Prototyped the Dacxi Chain MVP: Go internal API integrated with Solidity smart contracts, NestJS public API, and a Svelte + Firebase frontend.
Built the production application in Vue.js and Laravel, covering REST API, design-system components and complete user flows with accessibility and performance in mind; documented the API with OpenAPI.
Set up CI/CD with GitHub Actions (AWS for production, DigitalOcean for staging) and wrote unit, integration and E2E suites that kept regressions low.
Delivered the operations team's admin panel with Laravel Nova.

Stack: Vue.js, Pinia, TypeScript, Laravel, PHP, Go, NestJS, Solidity, MySQL, Redis, Docker, Playwright, Jest, Pest, GitHub Actions, AWS, DigitalOcean

Full Stack Developer — Wealth99

Apr 2022 – Apr 2024

Led the rebranding and re-architecture of a whitelabel investment platform, migrating Vue 2 to Vue 3, Webpack to Vite, and introducing TypeScript.
Built financial charts, transaction history, buy/sell asset flows and an interactive portfolio dashboard.
Optimised customer wallet operations and asynchronous service-order processing in the REST API, improving transaction speed.
Integrated ERC-20 tokens (BAT, NEAR, EOS, MKR, SAND, ALGO, UNI) and maintained self-hosted Ethereum (Geth), Bitcoin, Litecoin and Bitcoin Cash nodes; contributed to Solidity smart-contract audits for DACXI token transactions.

Stack: Vue.js, Vuex, Pinia, Vite, TypeScript, Laravel, PHP, Laravel Nova, MongoDB, MySQL, Redis, Docker, PHPUnit, Mixpanel, HubSpot

Earlier Experience

Full Stack Developer, Xenara AI — May 2025. Designed, developed and tested platform features with Next.js, NestJS, TypeScript and MongoDB.

Full Stack Developer, Universidade Federal do Pará (UFPA) — Sep 2021 – Sep 2022. Maintained UFPA's institutional repositories (RIUFPA, BDM, Livro Aberto), migrated the Patent Repository (RIPAT) from DSpace 6 to 7, and automated server routines and backups with Python, Cron and SSH. Built internal systems for the Central Library and maintained institutional WordPress sites.

Education

MBA, Information Technology Administration and Management — Anhanguera Educacional, 2025

Postgraduate Specialisation, Software Architecture — Anhanguera Educacional, 2024 – 2025

Postgraduate Specialisation, Software Engineering — UniFECAF, 2021 – 2022

BSc, Information Systems — Universidade Federal do Pará (UFPA), 2021 – in progress

BTech, Supply Chain and Logistics Management — UNIP, 2019 – 2021

Languages

Portuguese — Native · English — Professional working proficiency · Spanish — Elementary