Senior Java Engineer

Designed and developed a microservices-based customer onboarding and core platform serving more than 2 million users using Java 17, Spring Boot 3, and Netflix Conductor. Implemented event-driven services with Apache Kafka processing more than 50,000 messages per second with exactly-once semantics, and built REST and gRPC APIs handling over 10,000 TPS with sub-100 ms P99 latency.

Architected savings products for flexible, locked, and target savings, including interest calculation, maturity processing, recurring deposits, and automated workflows processing over 100,000 daily transactions. Optimized PostgreSQL queries and sharding, introduced Redis caching and JVM tuning, and implemented Jaeger, Prometheus, and Grafana observability to support a 99.95% uptime SLA. Mentored junior engineers and participated in technical interviews.

Designed and built a high-throughput blockchain data ingestion pipeline processing more than 1 million transactions daily using Java, Spring Batch, Apache Kafka, and BigQuery. Implemented ETL workflows with Apache Airflow and custom processors, achieving 99.9% data accuracy.

Developed multithreaded data aggregation services using Java concurrency utilities and the Fork/Join framework. Built a Spring Cloud Gateway API serving more than 100,000 daily requests, implemented reactive real-time streaming with Spring WebFlux and Project Reactor, and improved JVM efficiency through G1GC tuning and memory profiling.

Developed enterprise HR disciplinary and time-management modules serving more than 10,000 employees using Java 8, Spring Boot, and Hibernate. Built a payroll calculation engine with business rules supporting Nigerian tax regulations.

Designed a schema-isolated multi-tenant architecture for more than 200 client organizations. Created reporting capabilities with JasperReports and implemented scheduled job execution using Quartz.