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Back-end Developer & System Architect at Frip- Led the transformation of a monolithic service offering RESTful APIs into a modern, scalable microservices architecture (MSA) with Domain-Driven Design (DDD), providing GraphQL APIs.- Initiated and successfully deployed Frip's first OpenAPI, overseeing its management and integration with external services.- Managed key domains including coupons, category hierarchies, social feed, product list caching, and badge features, ensuring high performance and user engagement.

LivePEMS v2.0 (Power-Equipment IoT Monitoring System)- System Design & Data Modeling for a oneM2M-based IoT monitoring solution.- Engineered middleware server and established preprocessing workflows.- Successfully deployed the system across over 20 locations.Educational Systems Development & Maintenance- Developed and maintained Java-based educational management systems utilizing Spring and Struts frameworks.- Projects included training management systems for Gongju National University of Education and autonomous training centers in Chungcheongbuk-do and Jeju.