Senior Backend Developer

• Designed and implemented scalable data pipelines using Dagster, Mage, DBT, and ClickHouse
• Built and optimized event tracking, transformation, and attribution systems for various ad platforms (Google, Meta, TikTok, Facebook, Taboola)
• Developed webhook connectors and integrated APIs for Shopify, Shopware, Perspective, Woocommerce, and Elopage
• Implemented observability infrastructure including metrics, tracing, and logging with Grafana, Loki, Prometheus, and OpenTelemetry
• Led architecture and implementation of custom query systems (OneQL) with JSON-to-SQL translation and validation
• Developed authorization middleware using AWS Cognito groups and implemented fine-grained role-based access control
• Integrated and extended Fivetran connectors, managed schema migrations, and built support for custom data models
• Researched and prototyped ETL/ELT tooling using Temporal, Airbyte, and PyAirbyte for connector orchestration
• Wrote extensive integration tests, improved performance and reliability, and contributed to system-wide refactors

Technologies: Go, Python, ClickHouse, DBT, Dagster, Mage, Kafka, Redis, Grafana, OpenTelemetry, Prometheus, Fivetran, Airbyte, AWS, SQLAlchemy, REST APIs

• Working as a Contractor to FOX Broadcasting.
• Hold the position of a Senior Software Engineer
• Working on the Keystone team, which is responsible for the core services (written and Golang and NodeJS) like the pipeline responsible for ingesting new data.
• Worked on scripts and automated tools such as Slack commands in Python

• Mercadolibre is the biggest e-commerce platform in Latin America.
• Worked at the cross-docking team of Mercado Envios (Mercadolibre’s solution to delivery).
• Working to improve the IT solutions deployed on Mercadolibre’s hubs, building applications focused on performance gain, defensive development, cache control, asynchronous process, high-performance databases, log control, and microservices scalability.

• Had the opportunity to work on the most significant payment gateway in Latin America. This experience made him enthusiastic about innovations in the payment market.
• Created React web apps using Redux

• Participated and helped to architect the migrations of the Culture Department's services from an on-premise server to a public Cloud (AWS).
• Created public APIs written in Python using Django

• Firjan is a company owner of SENAI institution in Brazil, which is an excellent institution of technical courses
• Rafael took his first steps in the computer programming world, and as a final project of this course, he built a Control Access System for the school using RFID technology; with the project's success, he was contracted as a programmer to implement it in other schools.