Project Case Studies

Selected products and client projects are documented around problems, implementation choices, and outcomes.

Live

BudongsanBank Agency Manager

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

Cross-platform MobileiOSAndroidApp StoreGoogle PlayB2B Operations

Live

PourLog

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

ExpoReact NativeTypeScriptNestJSNext.jsPostgreSQL+4
Status: Live
Read Case Study
Redictionary (WordBrain) project screen

Redictionary (WordBrain)

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

NxTypeScriptReactViteNestJSRedisJSON+4
Status: In Development / deployment history
Read Case Study

Live

JodalN

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

Next.js 15NestJS 11TypeScriptPrismaPostgreSQLLLM+4
Status: Live
Read Case Study
MVNO Hub Renewal project screen

MVNO Hub Renewal

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

JavaSpringOracleRESTful APIKakao AlimTalkGit
Status: Delivered
Visit
Read Case Study

Delivered

IBS Education Management System

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

JavaSpring FrameworkeGovFrameworkJSPjQueryMyBatis+3
Status: Delivered
Read Case Study

Live

Tech Collection

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

Spring Boot 3PuppeteerOpenAI APIMySQLGCP Cloud RunCloud Storage+1

Live

Thanks Note

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

React NativeExpoTypeScriptNestJSPostgreSQLTypeORM+4

Discontinued

MyMemory

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

ExpoReact NativeExpressJSMongoDBGCP Cloud RunCloud Storage+1
Status: Discontinued
Read Case Study
OnePick project screen

OnePick

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

Next.js 14ReactTypeScriptFirebaseTailwindCSSRecoil+2
Status: Discontinued
Visit
Read Case Study

In Development

Metapis

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

Spring BootJavaReactJavaScriptMySQLGit
Status: In Development
Read Case Study

Delivered

Evidence Collection Crawler

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

PythonSeleniumMySQLGitData Pipeline
Status: Delivered
Read Case Study

Discontinued

DesignMe

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

C#UWPASP.NETAzure Cosmos DBAzure FunctionsPower BI+1
Status: Discontinued
Visit
Read Case Study