John Paul Perez

I’m a Senior Full Stack engineer with 16 years building resilient, scalable platforms for banking and fintech. I specialize in microservices, API design, and real-time systems, and I’m proven at decomposing monoliths and leading observability and reliability programs.

At Leader Bank, I led a redesign of a core payments microservice to improve availability and throughput—reducing transaction latency by 38% and strengthening resilience during peak hours. I implemented event-driven architecture with Kafka and gRPC, built secure REST and WebSocket APIs with OAuth2, and used Terraform and Kubernetes to cut deployment times by 60% while standardizing multi-region production environments.

I’ve also driven measurable outcomes through incident response and performance improvements: I reduced MTTR by 50%, optimized PostgreSQL schemas and added read replicas for a 3x query throughput improvement, and mentored teams to increase deployment confidence while reducing production hotfixes by 42%. Previously at Ramp, I delivered payment services with 99.99% uptime, advanced realtime updates with WebSockets/SSE, and owned observability (Prometheus, Grafana, Datadog) to reduce production incidents by 48%; earlier at Beal Bank, I built secure banking APIs with Spring Boot, migrated batch workflows to event-driven services (4x throughput), and improved fraud detection and monitoring outcomes across the stack.