kifen raphael

I am an experienced Java/Spring Boot engineer focused on designing and delivering secure, scalable backend systems, microservices, and real-time data pipelines. I prioritize performance, concurrency, and system reliability while collaborating effectively with cross-functional teams.

At Arch Network I built a real-time event-driven backend indexer using Java, Spring Boot, Kafka, and PostgreSQL to deliver low-latency, high-throughput data for dashboards and analytics. I also contributed low-latency RPCs and telemetry in Rust with gRPC to improve observability and messaging performance.

Previously, I architected driver-rider matching and high-throughput payment services using Java 17, Spring Boot, Hibernate, PostgreSQL, Redis, Kafka, and PostGIS, and led migrations that improved uptime, security, and integration with microservices. I optimized analytics pipelines and hand-tuned SQL for faster business reporting.

I have built wallet and authentication services that processed large transaction volumes, increased test coverage with JUnit and Mockito, and implemented non-blocking processing with Spring WebFlux. I work across Java, Rust, Python, and TypeScript and leverage AWS, Docker, Terraform, and CI/CD to run reliable production systems.