At Chain Sys Corporation, I built and maintained 10+ production REST APIs in a Java and Spring Boot microservices architecture, integrating PostgreSQL and Oracle for enterprise data-integration workflows. I also diagnosed and resolved production defects across distributed services.
I built Passage Logistics Systems, a multi-role logistics platform with JWT authentication and role-based access control. Its REST APIs support shipment lifecycle tracking, and the platform reduced processing time by 25%.
I also designed a backend operations platform with centralized exception handling and audit logging, and built a thread-safe scheduler for cron-based jobs with execute, cancel, reschedule, and retry operations.
