Selected products and client projects are documented around problems, implementation choices, and outcomes.
Live
BudongsanBank Agency Manager
A cross-platform business app for real estate agency members, released on both iOS and Android and operated for 1,000+ registered users.
Proof
Released the app on both App Store and Google Play
Live
PourLog
A six-language coffee tasting SaaS across iOS, Android, Web, Admin, and API, with OCR-assisted record creation and a TypeScript monorepo.
Proof
Built iOS, Android, Web, Admin, and API surfaces from one product architecture
An AI-powered English-Korean vocabulary learning service combining structured dictionary generation, Redis caching, TTS audio, and quizzes.
Proof
Built a full-stack vocabulary service with React, NestJS, Redis, OpenAI, and Google Cloud
Live
JodalN
A production-grade public procurement SaaS that collects Korean G2B bid data, summarizes attached documents with LLMs, and supports high-speed search.
Proof
Built a production-grade SaaS with 19 Prisma models and extensive database indexing
A public-service renewal project that delivered telecom order integration APIs, order-status Kakao AlimTalk notifications, and a 32x Oracle query improvement.
Proof
Delivered real-time order integration APIs for external telecom operators
Delivered
IBS Education Management System
A public-sector SI project that integrated training operations, attendance, online lectures, certificates, payments, and role-based administration.
Proof
Launched an integrated training platform for IBS employees
Live
Tech Collection
A live AI curation blog aggregator that crawls technical blogs, summarizes and classifies posts with ChatGPT, and improved TPS by 15x through caching.
Proof
Built an automated crawl, summarize, classify, and serve pipeline
Live
Thanks Note
A mobile application for recording daily gratitude and emotions with offline-first architecture, real-time synchronization, and advanced user management.
Proof
Released a production mobile app for gratitude and emotion records
Discontinued
MyMemory
A cross-platform delayed-letter app that locks messages until a sender-selected date, combining photo sharing with a private memory experience.
Proof
Operated a cross-platform letter and photo sharing app for about 1.5 years
A photo diary web app for recording one photo per day, managing journeys, inviting collaborators, and documenting a polished Next.js/Firebase UI.
Proof
Built a complete photo diary app from planning to deployment
In Development
Metapis
A public-sector project management system that automates work tracking, schedules, reports, and data visualization for operating teams.
Proof
Designed and implemented the core PMS modules
Delivered
Evidence Collection Crawler
A high-volume data collection pipeline that gathered about 19TB of video data over two months for AI illegal-content classification training.
Proof
Collected about 19TB of video data over two months
Discontinued
DesignMe
A Windows schedule management app that supported everything from deadline-free todos to detailed plans with UWP and Azure serverless architecture.
Proof
Released and operated a Windows schedule management app for about one year