At SOF Co., Ltd., I develop ERP, HRM, finance, warehouse, and e-commerce workflows that translate business rules into working modules. I also built reusable backend and CMS services so React and Next.js storefronts can reuse product, checkout, payment, and order-tracking functionality.
For order and inventory reliability, I synchronized ERP stock and orders across websites and POS, and implemented transaction-safe checkout, idempotent order codes, and recovery flows. I also improved attendance-report queries from about 3,000 ms to about 100 ms on 800K+ records through indexing, query tuning, and keyset pagination.
I'm independently developing a client-commissioned medical inventory application with Java, Spring Boot, React, and Electron. It includes workflows for examinations, personnel, stock, supplies, receipts, payments, and inventory reports.
On a university-commissioned Air Quality Monitoring System, I developed OCR processing for device readings, designed the Oracle database and PL/SQL routines, and implemented role-based access control and public REST APIs for measurement results.
