Open to opportunities

Jumael França Martins

@jumaelfranamartins

Message

I build full-stack systems, ETL pipelines, dashboards, and automations that improve operational decision-making.

Brazil

Message

What I'm looking for

I'm looking to build full-stack, automation, and data solutions that improve operations, strengthen decision-making, and create measurable efficiency gains.

At I-Systems, I build an end-to-end visual management web system for decision-making, using Node.js, TypeScript, Express, React, SQL, Redis, and asynchronous processing with Bull/BullMQ. I optimized SQL queries by approximately 80% and created ApexCharts dashboards for strategic indicators.

Previously at Ondacom, I automated operational data collection, processing, and delivery with Python, Pandas, and Selenium, generating an estimated 33% gain in reporting hours. I also built a React web dashboard and reduced registration time by approximately 80% through web automation.

Across data analysis and administrative operations roles, I’ve consolidated production databases, improved reporting routines, and strengthened the reliability of operational information. I combine full-stack development with ETL, automation, and data-driven decision-making.

Experience

Work history, roles, and key accomplishments

Current

Desenvolvedor Full Stack Node.js

Current

I-Systems

Sep 2024 - Present (1 year 11 months)

Develops a web-based management system for decision support, working end-to-end with Node.js, TypeScript, and Express backend and React frontend. Optimized SQL queries by approximately 80%, implemented Redis caching and asynchronous processing with Bull/BullMQ, structured ETL pipelines with Python and RPA, and created dashboards with ApexCharts.