Available for remote roles · EN C1
Senior Software Engineer / Tech Lead
I take validated products and make them scale.
15+ years across Fintech, Edtech & Healthtech. I assess the legacy system, decide the architecture, and lead the team that ships it — backend-focused, hands-on.
15+Years experience
−83%Infra cost cut
16×Faster API response
10×Paid user growth
01 — About
Backend scale, real product outcomes.
My specialty is one situation: a validated product that needs to scale. I do my best work where backend scale meets real product outcomes — not architecture for its own sake, but the decisions that move cost, latency, and growth.
Recent work spans a Go price-streaming microservice handling real-time market data on Cloud Run, a referral engine that grew a paid base 10×, and cloud optimization that cut infrastructure costs by 83%. I stay roughly 65% hands-on: I design the architecture and review the code, and I run the team.
02 — Skills
Technical stack
Frontend
Cloud & Infra
Architecture
03 — Experience
Where I've shipped
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Tech Lead · Pipwars
Rescued an abandoned product and shipped it to the App Store and Google Play. Built a Go SSE price-streaming microservice on Cloud Run and cut infrastructure costs 83% ($3,000 → $500/mo). Led a team of three.
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Backend Engineer · Oliveira Trust
PHP 8+ microservices on AWS (Lambda, SQS, SNS, DynamoDB, ECS/EKS) with Kubernetes. Observability and load testing with Grafana and JMeter.
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Senior Fullstack Engineer · Afya (iClinic)
Distributed serverless systems for medical records, prescriptions, and real-time telemedicine. Cut median API response time 16× on the LMS platform; migrated a legacy frontend to Next.js with an in-house design system.
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Fullstack Engineer · Stone Age
Evolved a C# anti-fraud platform monitoring call-center interactions in real time for Brazil's largest banks — detecting impersonation on credit-limit requests.
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Fullstack Engineer · Jaleko
Split a Laravel monolith into a separate frontend and API across two repositories, and built a referral growth engine from scratch that grew paid users 10× (300 → 3,000+).
04 — Projects
Things I build on my own
Buscador de Concursos
A search app for Brazilian public-service exams — aggregating open competitions (concursos) into a fast, filterable interface so candidates find the right openings without digging through official bulletins.
NeoGrow
A growth tracker for premature babies — plotting weight and height against corrected-age percentile curves, helping parents and clinicians follow a preemie's development with clarity.
05 — Contact
Let's build something that scales.
Open to remote international roles and hands-on Tech Lead work. The fastest way to reach me is email.
vmcruz89@gmail.com