Gabriel Fonseca

Loopio

Building and shipping features for enterprise clients on a B2B SaaS platform. Working across the stack — backend with Symfony and PHP, frontend with React and TypeScript. Focused on performance, test coverage, and collaborating closely with product and QA.

Netcoins

Built and shipped critical fintech features including Staking and KYC flows, directly impacting revenue and regulatory compliance. Spearheaded the adoption of automated testing across the engineering team, significantly reducing production bugs and establishing a quality-first culture. Refactored legacy codebases to improve maintainability and developer velocity.

M56 Studios

Designed and built REST API endpoints powering the Fit52 fitness platform. Owned end-to-end integration with third-party services including Shopify, Stripe, Segment, and RevenueCat, enabling seamless payment processing and subscription management.

Leroy Merlin Brasil

Scaled the 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.

Museu de Arte de São Paulo – MASP

Built internal tools that streamlined administrative workflows and improved operational efficiency 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 museum experience. Delivered fullstack solutions across multiple frameworks deployed on Azure.

Digital Video Music

Built and delivered web solutions for clients across multiple industries, progressing from static sites to full dynamic applications. Grew technical skills from junior to mid-level, gaining solid foundations in PHP, JavaScript, and relational databases.