Marco Oliveira
Senior Software Engineer
Building high-throughput backend systems for fintech & payments. 6+ years crafting scalable Go services processing thousands of transactions per minute.
// About
Get to know me
Software Engineer with 6+ years of experience building high-performance backend systems in Go. Specialist in fintech and payments, with experience at Itau/Rede (SPB modernization, transaction processing) and regulated payment institutions (BACEN/CADOC compliance). Track record of technical leadership and scaling systems to 2,000+ transactions/min.
Based in Aracaju, Brazil. Currently working at Asap Tech building automated regulatory document systems for credit card issuers. Open to remote opportunities worldwide.
Core Stack
// Experience
Where I've worked
Senior Software Engineer
Asap Tech
Architected automated CADOC regulatory document generation for 3 credit card issuers, integrating BACEN validator with 100% compliance accuracy and real-time alerts
Built and maintain 6+ report types on daily, weekly and monthly cycles using Go and RabbitMQ for async processing, deployed on AWS with Docker and Kubernetes
Senior Software Engineer
Zup Innovation (Itau / Rede)
Contributed to SPB (Brazilian Payment System) service modernization at Itau, migrating critical financial infrastructure to multi-cloud architecture
Modernized Rede's transaction processing backend, redesigning services as BaaS components for multi-cloud deployment
Built observability dashboards with Grafana, Prometheus and OpenTelemetry; Go microservices with cell-based architecture and ArgoCD deploys
Tech Lead
Klever
Led team of 6 building multi-chain custody system for NFT games; processed 2,000+ on-chain tx/min avg, 100K+ off-chain transfers at launch
Built real-time blockchain audit system detecting unauthorized wallet transactions instantly, triggering progressive incident escalation pipeline
Managed real-time infrastructure scaling during Devikins launch (20K+ signups) — pod autoscaling, CPU and memory to absorb demand spikes
Backend Developer
Klever
Core contributor to Klever Exchange from POC to production: 1M+ daily order matches, 5K concurrent users, $250K+/day volume, 60+ trading pairs
Co-designed and built the core match engine with distributed, resilient architecture where each trading pair operated independently
Championed testing culture company-wide: introduced test pyramid practices, sqlmock for DB unit tests, and CI gates with SonarQube
Mobile Developer
Klever (formerly Getty/IO)
Maintained and evolved TronWallet and Klever Browser, integrating multi-chain support (BTC, ETH, TRX, BNB). Stack: React Native, Redux, Jest, Espresso
// Skills
Technologies & tools
Languages & Frameworks
Cloud & Infrastructure
Messaging & Streaming
Databases
Observability
Practices
// Contact
Let's work together
I'm currently open to new opportunities. Whether you have a question or just want to say hi, feel free to reach out.