Apps I built, hands-on practice notes, and step-by-step lessons in one place.
5 services I built and run.
Learn Korean / English from a single screenshot
Turn everyday text into a personal language tutor. Capture any screen — webtoons, SNS, news — and start pronunciation practice with Tesseract OCR + STT/TTS. Android-first, Windows companion.
Your personal flavor diary
A personal food log with four reaction buckets — 'loved / try again / not for me / not sure', local SQLite storage, source-based filtering. Android + Windows dual target.
Price · medical · long-term-care public-data platform
pryzeet.duckdns.org
A price-share → wishlist → ledger → re-buy platform. Aggregates salaries (NPS+DART), medical non-covered fees (HIRA), and long-term-care facilities via Playwright crawlers — searchable in one place.
Local-OCR · vector-search chat service
dmddksl.duckdns.org
Extract text via OCR, retrieve via pgvector, answer via local LLM chat. Spring WebFlux + Kafka + Redis backend with LM Studio inference.
A garden-of-the-heart diary
da2ari.duckdns.org
Diary, horoscope, and saju in one Korean-first daily companion. Supabase Auth + Java 21 Spring Boot 4 BFF + Python LM Studio (gemma4) LangChain horoscope generation.
A development primer for beginners — and a portfolio of the apps I built.
A full-stack developer building practical tools and public-data services across mobile (Tauri/Flutter), web (Next.js), and backend (FastAPI/Spring), with a focus on AI/LLM integration.