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Leonardo Fertonani

@leonardofertonani

Backend Engineer at Atual Soluções / CodeHarbor, building ERP integrations and a RabbitMQ gateway that cut RPC timeouts to zero.

Brazil

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What I'm looking for

I'm seeking a remote backend or distributed-systems role.

At Atual Soluções / CodeHarbor, I own backend services around a retail ERP used by hundreds of businesses, including queues and fiscal and partner integrations. I also build React front ends when a product needs one.

I built a NestJS and PostgreSQL audit backend and React front end for a hospital-audit client, digitizing medical-bill appeals and making the operation 70% faster and 35% cheaper.

For the retail ERP, I added a reconnect watchdog, AMQP heartbeat tuning, a chaos bench, and Grafana access logs to a .NET 8 RabbitMQ gateway. That work cut RPC timeouts from 300–630 per 10 minutes to zero.

Previously at Speedio, I maintained RabbitMQ-backed data pipelines and specialized scrapers for a B2B sales-intelligence platform, then built a CNPJ company-search app with Redis caching and PostgreSQL.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer

Current

Atual Soluções / CodeHarbor

Nov 2025 - Present (11 months)

Owns the backend around the ERP, including queues, fiscal and partner integrations, and products built on top of it. Digitized a hospital-audit client's medical-bill appeals operation, built a WhatsApp campaign platform, and developed fiscal-document pipelines.

TypeScript NestJS C# .NET 8 Java Kotlin PostgreSQL Redis RabbitMQ OpenTelemetry Loki Docker Kubernetes GitHub Actions React Expo OpenAI

Backend Developer

Speedio

Feb 2025 - Nov 2025 (9 months)

Designed and maintained ETL/ELT pipelines over large B2B company datasets, decoupled through RabbitMQ queues. Wrote specialized scrapers and profiled big-data workloads to improve performance.

Python ETL ELT RabbitMQ Web Scraping Distributed Processing PostgreSQL

Python Developer

Speedio

Nov 2023 - Feb 2025 (1 year 3 months)

Replaced HubSpot with a more cost-effective CRM, automated internal workflows with Node-RED and n8n, and built an SEO web app with Redis cache-aside and Docker deployment.

Python Django PostgreSQL Redis Docker Node RED N8n