Open to opportunities

Eduardo Zago

@eduardozago

Message

Backend Software Engineer specializing in Node.js, NestJS, and production AI-agent integrations.

Brazil

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What I'm looking for

I’m looking for remote-first roles with Americas & Europe-based teams (GMT-3), where I can own backend architecture end-to-end, build scalable production APIs, and ship AI-agent/LLM integrations that measurably improve performance and workflows.

I’m a backend-focused Software Engineer with end-to-end ownership of production systems, often as the sole engineer behind a multi-tenant B2B SaaS platform. I lead architecture and infrastructure decisions while delivering features in a production-first, reliability-minded way.

In my current role, I built RESTful APIs with Node.js (NestJS) and TypeScript using Clean Architecture, SOLID, DDD, and event-driven design (RabbitMQ, Redis). I re-architected a synchronous WhatsApp validation workflow into a fully asynchronous pipeline, cutting processing time by 60%+, and I integrated third-party ISP management platforms to replace manual spreadsheet batch processes with real-time syncing.

I also build AI agents and integrate LLM APIs (Anthropic Claude, OpenAI, Gemini) into production workflows, backed by two-time Borderless Coding hackathon wins. Before that, I worked in research engineering—creating Python-based LiDAR pipelines on Raspberry Pi and building ML models with scikit-learn—so I bring both engineering rigor and data/ML intuition to the teams I join.

Experience

Work history, roles, and key accomplishments

Current

Freelance Full-Stack Dev

Current

Freelance

Sep 2025 - Present (9 months)

Built a secure real-time medical communication platform using Next.js and Supabase, implementing role-based authentication and granular access control with real-time messaging APIs for SaaS productization.

Next.js React TypeScript Supabase PostgreSQL Role Based Access Control SaaS architecture

Current

Full-Stack Developer

Current

Medical Communication Platform

Sep 2025 - Present (9 months)

Built a secure real-time communication platform for medical teams using Next.js, React, and TypeScript with Supabase. Implemented role-based authentication, granular access control, and real-time messaging APIs backed by PostgreSQL to support SaaS productization.

Next.js React TypeScript Supabase PostgreSQL Role Based Access Control Access Control Real Time Communications

Current

Full-Stack Software Engineer

Current

B2B Cobranças Inteligentes

Jan 2025 - Present (1 year 5 months)

Sole software engineer and technical decision-maker for a multi-tenant B2B SaaS collections platform, delivering REST APIs with NestJS/TypeScript and leading infrastructure on Fly.io and Docker. Reduced WhatsApp validation processing time by 60%+ by converting a synchronous workflow to an asynchronous RabbitMQ/Redis pipeline and enabled new business acquisition via third-party ISP system API integ

NestJS TypeScript REST APIs Clean Architecture DDD RabbitMQ Redis PostgreSQL Prisma

Software Engineer (Research)

LPA Research Laboratory

Jul 2024 - Dec 2024 (5 months)

Built Python-based LiDAR sensor processing pipelines and embedded Raspberry Pi systems, integrating hardware drivers with real-time data capture, signal processing, and validation workflows. Produced analysis and visualization tooling with Pandas and Matplotlib to support research decision-making with agronomists.

Python Pandas Matplotlib Raspberry Pi Linux Data Pipelines Signal Processing

Software Engineer (Research)

Federal University of Santa Catarina

Jun 2023 - Jul 2024 (1 year 1 month)

Developed and evaluated scikit-learn ML models to predict academic performance and dropout risk from Moodle behavioral datasets, including cleaning, feature engineering, EDA, and model evaluation. Delivered data-driven findings and translated results into actionable recommendations for academic stakeholders.

Python scikit learn Pandas SeaBorn Matplotlib Data Cleaning Feature Engineering