AI-Native Full-Stack Engineer — Cafe24
Analyze. Architect. Ship to the end.
Vitess · Citus · ClickHouse Infrastructure
Designed and operate a distributed database infrastructure handling large-scale e-commerce traffic. Scale-out architecture combining Vitess (MySQL horizontal sharding), Citus (PostgreSQL distributed queries), and ClickHouse (real-time analytics engine).
Vitess / Citus / ClickHouse / Terraform / Prometheus / Linux
Unified WMS (Smart Inventory / FBWMS)
A SaaS warehouse-management system unifying Cafe24 Smart Inventory and the FastBox FBWMS subsidiary. Inbound/outbound, inventory tracking, order integration, automated Excel/PDF reports, and barcode/QR scanning.
Spring Boot / Next.js 15 / PHP / MSSQL / AG Grid / MyBatis
11st Product Domain Refactoring
AS-IS design analysis and MSA · DDD-based refactoring of the tangible/intangible product domain at 11st. Led the modernization of the legacy WebLogic · iBatis · ext.js stack while running maintenance and new development in parallel as PM.
Java / Servlet / iBatis / WebLogic / ext.js / MSA · DDD
Private Cloud SKT
SK Telecom in-house private cloud management system. VMware/Xen cloud provisioning profile integration, responsive Bootstrap admin UI, and a REST API integrated with Windows Active Directory.
Java / Spring / Bootstrap / VMware · Xen / Windows AD / PowerShell
Electric-Bus Battery Swap Control System
Battery-swap depot (TOC) control system for the Jeju electric-bus fleet. Built a gateway over xmpp/mqtt/modbus and the TOC_WEB UI, with code quality managed via PMD/FindBugs/SonarQube.
Java / Spring / JPA / MQTT · XMPP · Modbus / Jenkins
SKT Recruitment System
Migrated the SK Telecom recruitment system from legacy ASP to Java/Spring/MyBatis. Integrated SAP JCO ERP for HR data, developed OZ Report templates, and unified SSO with Active Directory / LDAP.
Java / Spring / MyBatis / SAP JCO / OZ Report / AD·LDAP
Jeju Airport Control System
Built the Jeju Airport control system. Reverse-engineered the Gimpo Airport system for AS-IS analysis, redesigned the physical/logical ERD with full data migration, integrated LCU/PLC, ran modbus over the power line, and embedded real airport-map coordinates via AutoCAD xdata.
Java / Spring / MyBatis / JSP / JMS / Modbus / AutoCAD xdata
Side projects and open source I run outside of work — live services deployed to Cloudflare Workers/Pages, public GitHub repos, and early learning projects. Click each group header to expand or collapse.
Live · Cloudflare Side projects deployed on subdomains
blnk — AI Agent Platform
AI · Rust · TypeScript
"Your personal AI, always on." A multi-platform AI agent on Telegram, Slack, and Discord. File reading, code writing, web browsing, and computer-task automation. Also runs as a CLI on macOS · Windows · Linux.
humanize
AI · Cloudflare Pages
Korean "AI-tone" rewriter. Smooths out the awkwardness of AI-written prose.
ReturnShield
AI · SaaS · Workers
AI-driven return-fraud detection. Learns e-commerce return-abuse patterns and blocks them automatically.
VoC Radar
Analytics · Workers
Dashboard that turns customer feedback into product insight. Multi-channel VoC collection plus LLM summarization.
Stylifly
AI · Fashion · Workers
AI-personalized style guide. Fashion recommendations based on body type and taste.
Care Bridge
Healthcare · Workers
A matching platform for caregivers and care seekers, connecting families with care providers.
LifePass
Mobility · Workers
A vehicle-acquisition comparison platform (rental/lease/subscription) with lifestyle-matched recommendations.
Law Search
Search · LLM · Workers
Semantic search service for Korean statutes — query in natural language to find the relevant articles.
Block Blast!
Game · Workers
Web version of a casual block-puzzle game.
Catch Mind
Game · Realtime · Workers
A realtime multiplayer drawing-and-guessing game.
Apps · Products Full-fledged products built as side projects
eXmate OMS
Spring Boot 3 · Java 17 · MSSQL
Order-management system (OMS) side project. Spring Boot REST API, ZXing barcode/QR generation, iText7 PDF reporting, Apache POI Excel processing, Spring Security JWT auth.
EyeChartPro
Node.js · Express · MSSQL · Redis
Cloud EMR system specialized for ophthalmology — appointments, clinical notes, and vision-test data unified, with Redis caching for fast responses.
Open Source Public packages on GitHub · npm
Dev Inspector — MCP Server
TypeScript · MCP · npm
A DOM-inspection Express middleware and MCP server for AI coding assistants (Claude Code, etc.) — realtime DOM analysis, accessibility audits, React component introspection, screenshot capture, and design-token extraction.
music-api-kr
JavaScript · Library
Unified API library for Korean music charts (Melon, Genie, Naver, Bugs, FLO, Hanteo, YouTube). Published as an npm package.
im-not-ai (humanize)
TypeScript · Skill · Fork→Maintain
A skill that rewrites text "as if it weren't written by AI." Pattern detection + custom rewrite rules in TypeScript.
sideJobCommunity
HTML · Community
Community platform for sharing side jobs and side projects.
2016 — 2018 Early experiments · learning repos
docker-java8-jenkins-etc
Shell · DevOps
Docker image for a Java 8 + Jenkins CI environment.
docker-nginx-php5-fpm
Shell · DevOps
Docker image for an Nginx + PHP-FPM 5 dev environment.
docker-java8-jenkins-maven-git
Shell · DevOps
Combined Java 8 + Jenkins + Maven + Git build container.
EarthquakeAlarmForKakaotalk
Java · Bot
Java bot pushing real-time earthquake alerts to KakaoTalk.
Play-with-Activator-Sample
Scala
Learning sample for Scala Play Framework + Activator.
All GitHub repos → github.com/love5757
From enterprise WMS to distributed-DB infra.
At Cafe24 I built the unified Smart Inventory / FBWMS warehouse system, and now develop and operate a large-scale distributed database infrastructure on Vitess, Citus, and ClickHouse. Across SKT recruitment migration, 11st commerce refactoring, electric-bus IoT, and Jeju Airport control, I have owned the full lifecycle — analysis through deployment.
What I do
Backend
- Java / Spring Boot
- Node.js / Express / Hono
- PHP / Laravel
- Python
- Rust
Frontend
- React 19 / Next.js 15
- Vue.js
- TypeScript
- Tailwind CSS
- AG Grid
Data
- Vitess (MySQL Sharding)
- Citus (PG Distributed)
- ClickHouse (Analytics)
- MSSQL / PostgreSQL
- MongoDB / Redis
Infra & AI
- Cloudflare Workers/D1/R2
- AWS S3
- Docker / PM2
- Terraform / Ansible
- OpenAI / Claude MCP
2017.07 — Present
~ 8 yrs
Cafe24
Full-Stack Engineer · DevOps · Data Infra
Full-stack, DevOps, and data infrastructure at one of Korea's largest e-commerce SaaS platforms. From EC merchant tooling through apparel 3PL and a unified WMS, now operating a large-scale distributed data infrastructure on Vitess · Citus · ClickHouse.
- ▸ Vitess · Citus · ClickHouse distributed data infrastructure (current)
- ▸ Unified WMS — Smart Inventory / FBWMS
- ▸ FastBox apparel 3PL full-stack development
- ▸ Opera — EC merchant back-office
2014.03 — 2017.06
~ 3 yrs 4 mo
Feelingk
Backend · System Migration · IoT
At a B2B SI company, delivered system integration, legacy migration, IoT gateways, and cloud control across telecom, logistics, and public-sector domains. Led MSA/DDD-based refactoring as PM.
- ▸ 11st product-domain refactoring (PM, MSA · DDD)
- ▸ Private Cloud SKT — VMware · AD integration
- ▸ Electric-bus battery-swap control (TOC, mqtt · xmpp · modbus)
- ▸ Jeju Airport control system (LCU · PLC, AutoCAD xdata)
- ▸ SKT recruitment system (ASP→Java, SAP JCO, OZ Report)
- ▸ SKT Movie English (data migration, Oracle tuning)
Education
Gachon University Graduate School
M.S. in Mobile Software
2011 — 2013
Publication
DAISY 3-based accessibility e-book viewer. Reduced memory usage by 74%, audio playback speed improved 150%.
2014
Volunteer
32 blood donations since 1999, awarded the Silver Medal.
Korean Red Cross
Contact