Most SaaS products break at the exact moment they start working.
The customer base doubles and the cloud bill triples. The monolith that shipped fast in year one now takes an afternoon to deploy. Billing double-charges someone on a Friday night. Nobody wants to touch auth. Everyone is busy — and the roadmap stops moving.
I've spent 8+ years on the other side of that problem.
At Clinicorp (healthcare SaaS) I helped take the platform from 4,000 to 22,000 customers — 10K to 150K users — over 4.5 years, first as an engineer, then as solutions architect, then leading up to 12 developers. On the way: cloud costs down 33% while the customer base doubled, a Node.js monolith broken into microservices on GCP (Cloud Run, Pub/Sub, BigQuery, Spanner, AlloyDB), and login hardened with data fingerprinting and biometrics.
Today I build a multi-tenant clinic-management SaaS end to end: Brazilian e-invoicing (NFS-e, NF-e, NFC-e with POS), recurring payments and automatic reconciliation via Stripe and Pagar.me, and WhatsApp scheduling on the Meta Cloud API. The stack: Node.js, TypeScript, NestJS, React, Next.js, React Native, PostgreSQL, Docker and GCP, with REST and event-driven APIs. I also run AI agents as part of my daily delivery — behind a 2,500+ test suite and an adversarial review pass before anything merges.
What I'm actually good at: money-critical systems (payments, invoicing, billing) that can't lose a cent, distributed systems that stay cheap under growth, and writing the ADR before writing the code.
Two MBAs (Solutions Architecture; Cyber Security), a BSc in Software Engineering, and 3 years teaching programming at SENAI — which is why I can explain a trade-off to a non-engineer without hand-waving.
Open to Senior/Staff engineering roles, remote (LATAM · UTC-3).
I develop a multi-tenant clinic-management SaaS using Node.js, TypeScript, React, React Native, and Google Cloud Platform.
I build electronic tax document modules for NFS-e and NF-e, POS integrations for NFC-e fiscal receipts, payment processing through Stripe and Pagar.me, recurring billing, receivables reconciliation, and WhatsApp communication and scheduling integrations using the Meta Cloud API.
I coordinated the Solutions Architecture and User Experience teams, leading 12 developers and supporting hiring, feedback, and career development.
I led the decomposition of a monolithic Node.js server into microservices and prioritized refactoring initiatives across both teams.
I led a five-developer team responsible for internal platform tooling, including authentication, permissions, asynchronous task execution, and third-party integrations.
I drove FinOps initiatives that reduced cloud costs by 33% while the customer base doubled, and strengthened security with data fingerprinting and biometric login.
I designed cloud-native architecture on Google Cloud Platform for the full customer base, using Cloud Run, Cloud Functions, Cloud Tasks, Cloud Scheduler, and Pub/Sub.
I modeled data across Datastore, MySQL, Spanner, AlloyDB, and BigQuery according to application needs.
I delivered a B2B marketplace to production in three months, enabling customers to buy supplies from one another.
I developed the solution with Node.js, React, React Native, and Google Cloud Platform.
I taught technical courses alongside my engineering work at Clinicorp.
My instruction covered programming logic, web development, mobile development, Docker, and cloud technologies.
I built a SaaS ERP for electronic tax document issuance from scratch using Angular and .NET.
I also maintained an existing C# desktop system.
I implemented banking integrations for an ERP system using InterSystems Caché.
My work included remittance and return file processing for bank slip generation.
MBA, Cyber Security
MBA in Cyber Security.
MBA, Solutions Architecture
MBA in Solutions Architecture.
B.Sc., Software Engineering
Bachelor of Science in Software Engineering.
Technical Degree, Informatics
Technical Degree in Informatics.
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