Software Engineer · Fortaleza, Brazil

Rômulo Fraga

I build backend systems and write about software architecture, distributed systems, .NET, and things I learn while building software.

Selected Work

A production billing system that turns Master Data usage into invoices and manages platform credits across their full lifecycle.

An API that supports a fully digital onboarding flow, letting customers create VTEX accounts through self-service.

Validation support for Brazil’s alphanumeric CNPJ format while keeping existing numeric identifiers working.

Billing Is a Workflow, Not a Number
- Billing
- Data
- Distributed Systems
Sep 06
Changing an Identifier Format Without Breaking Integrations
- API Compatibility
- Validation
- Automated Testing
Jun 06
From Product Goal to a Self-Service API
- API Design
- Backend Engineering
- Product Delivery
Mar 06