Full-stack delivery of REST APIs and a Next.js front end for an apartment market platform — JWT RTR, virtual-account state machine, and blue/green deployment.
Multi-tenant SaaS ERP live across many sites — 20+ domains: accounting, billing, HR, assets, metering, etc. Meter-query response cut ~65% (~10s → 3–4s). cplxCd tenancy, shared QueryDSL layer, dual security chains.
Illegal-parking patrol for apartments. Android native app rebuilt from scratch, Spring Boot API and Next.js admin web developed. Real-time OCR plate recognition, SSO token integration, Docker/standard hybrid deployment.
New Kotlin Android app (my THEH / my HILLS) for Hyundai E&C apartment residents. Built core app architecture, key screens, RealmDB local caching, and WebView Bridge communication layer.
Mobile e-voting for apartment residents — full election lifecycle from setup to RSA tally and automated PII purge.
Community platform SI — helper domain full design and implementation, RFC 5545 rrule, Android WebView SSO. 3–4+ daily requests per site after launch.