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Guilherme de Oliveira Barros

@guilhermedeoliveirab

Back-End Developer at ClubPetro who developed microservices for a gas station loyalty program and optimized PostgreSQL queries.

Brazil

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At ClubPetro, I worked on microservices for a gas station loyalty program using Node.js, TypeScript, Fastify, and NestJS. I also focused on PostgreSQL data modeling and query optimization.

At Delta Global, I developed features for Assist, a process automation product supporting internal teams and automotive customers. I contributed to improvements in fleet claims management that reduced handling time and increased operational agility.

At Artefato Digital, I developed TOTVS Fluig datasets, BPM process forms, and integrations with TOTVS RM, and adjusted WCM widgets. I also developed React pages for Pipoca Ágil’s online platform and contributed to the Alumni Platform project at Fatec Zona Leste.

Experience

Work history, roles, and key accomplishments

TOTVS Fluig Developer

Artefato Digital

Jan 2026 - Sep 2026 (8 months)

Developed on the TOTVS Fluig platform, creating datasets, process forms (BPM workflows), and integrations with TOTVS RM. Created and adjusted WCM Widgets and developed solutions supported by AI tools such as Claude Code and Gemini.

Fluig Datasets BPM WCM Widgets TOTVS RM Claude Code Gemini

Back-End Developer

ClubPetro

Apr 2025 - Nov 2025 (7 months)

Worked on microservices-architecture projects using Node.js, JavaScript, TypeScript, Fastify, NestJS, TypeORM, Prisma, Kubernetes, and GCP, implementing solutions for a gas station loyalty program system. Gained experience with PostgreSQL, focusing on efficient modeling and query optimization.

NodeJS JavaScript TypeScript Fastify NestJS TypeORM Prisma Kubernetes GCP PostgreSQL

Alumni Platform Volunteer Internship

Fatec Zona Leste

Sep 2024 - Dec 2024 (3 months)

Developed the college's Alumni Project to strengthen the connection between graduates and the institution. Prepared technical documentation including UML, diagrams, and database modeling.

Laravel PHP HTML CSS JavaScript AJAX jQuery Bootstrap GitHub

Junior Full-Stack Developer

Delta Global

May 2024 - Aug 2024 (3 months)

Performed full-stack development on the Assist product, a solution for process automation and improving support efficiency for automotive customers. Improved fleet claims management, reducing handling time and increasing operational agility.

PHP CodeIgniter NodeJS JavaScript

Outreach Platform Developer

Pipoca Ágil

Oct 2023 - Aug 2024 (10 months)

Developed web pages with ReactJS for an online platform for people interested in the Pipoca Ágil website, with three user types each having different access levels. Used ReactJS with react-router-dom, Chakra UI, Styled Components, Yup, Axios, Context API, and GitHub.

React React Router Chakra UI styled components Yup Axios Context API GitHub