Hi, I'm
Gabriel Fonseca
Software Engineer
Building scalable, secure solutions since 2016
# About
Software engineer with nearly a decade of experience building scalable backend systems and APIs across industries such as fintech, e-commerce, and enterprise SaaS. Proficient in PHP, Node.js, and Go, with hands-on frontend experience using React and Vue. Passionate about code quality — I have championed automated testing practices, contributed to open-source projects, and mentored fellow developers. I thrive in cross-functional teams, turning complex business requirements into reliable, well-tested software.
# Experience
Software Engineer
Oct 2024 – Mar 2026Loopio
- Build and ship features for enterprise clients on a B2B SaaS platform
- Delivered the Business Unit licensing feature, enabling enterprise clients to purchase per-unit licenses at a lower price point — unlocking deals that were previously lost due to all-or-nothing pricing
- Work across the full stack — backend with Symfony and PHP, frontend with React and TypeScript
- Participated in the development of a C# microservice for RFP automation, implementing document composition and formatting features to preserve original structure when integrating responses
- Drive performance improvements and increase test coverage in collaboration with product and QA
Software Engineer
Jan 2023 – Oct 2024Netcoins
- Built and shipped Staking and KYC flows, directly impacting revenue and regulatory compliance
- Spearheaded adoption of automated testing across the engineering team, reducing production bugs and establishing a quality-first culture
- Refactored legacy codebases, improving maintainability and developer velocity
Software Engineer
Aug 2022 – Dec 2022M56 Studios
- Designed and built REST API endpoints powering the Fit52 fitness platform, serving 50K+ users
- Owned end-to-end integration with Shopify, Stripe, Segment, and RevenueCat for payment processing and subscription management
Backend Developer
Sep 2020 – Aug 2022Leroy Merlin Brasil
- Scaled Google Merchant Center product catalog from 200K to 800K products by building high-throughput data pipelines with Go and Apache Kafka
- Developed integrations with Facebook Business and BigQuery to power marketing and analytics
- Built and maintained REST APIs for a large-scale e-commerce platform with comprehensive test coverage
- Improved platform observability by implementing monitoring with Grafana, Datadog, and Confluent Conduktor
- Mentored junior developers and contributed to the team's open-source library, Metamorphosis
Fullstack Developer
Jun 2019 – Sep 2020Museu de Arte de São Paulo – MASP
- Built internal tools that streamlined administrative workflows for one of Latin America's most prominent art museums
- Designed and developed interactive visitor kiosks using real-time Web Sockets, enhancing the on-site experience
- Delivered fullstack solutions across multiple frameworks deployed on Azure
Web Developer
Jun 2016 – Jun 2019Digital Video Music
- Built and delivered web solutions for clients across multiple industries, progressing from static sites to full dynamic applications
- Grew from junior to mid-level, building solid foundations in PHP, JavaScript, and relational databases
# Tech Stack
Backend
Frontend
Frameworks
Testing & Observability
Databases & Caching
Cloud Computing
Integrations & Messaging
# Personal Projects
# Soft Skills
Technical Leadership
Drive technical direction and quality standards within teams, championing best practices such as TDD and code review
Mentorship
Guide and support junior developers through code reviews, pair programming, and knowledge sharing
Cross-functional Collaboration
Work effectively with product, QA, and business stakeholders to translate requirements into reliable software
Code Review
Provide thorough, constructive feedback that improves code quality and promotes team learning
Agile & Scrum
Experienced in agile workflows with a CSPO certification; comfortable with sprints, retrospectives, and iterative delivery
Analytical Problem Solving
Break down complex technical challenges — from high-throughput data pipelines to distributed system design — into pragmatic solutions
# Education & Certificates
Education
Systems Analysis and Development
Information Technology
Instituto Federal de Educação, Ciência e Tecnologia do Triângulo Mineiro
Feb 2015 – Feb 2018
Certificates
- Certified Scrum Product Owner (CSPO)
- KanBan Foundation (KIKF)
- DevOps Essentials Professional Certificate (DEPC)
- Verified International Academic Qualifications (WES)
Languages
- Portuguese — Native
- English — Fluent
# Get in Touch
Feel free to reach out for opportunities, collaborations, or just a friendly chat.
Send an Email