Hey there, I'm
Sangmin Lee.
A diligent researcher with lazy ambitions.
I like building systems that just work — solid, scalable, and boring in the best way. Currently a ROND 11th Cadet, heading to the Agency for Defense Development (ADD) after graduation.
01. About Me
I'm Sangmin, based in Daegu, South Korea. My long-term goal is to become a Big Tech CTO — but my life motto is honestly just "I want to live comfortably." Funny combo, I know.
Finishing up my final year at Kyungpook National University, majoring in Computer Science. Got selected as a ROND 11th Cadet, so after graduation I'll be doing research at ADD (Agency for Defense Development).
Along the way, I've worked at startups, done an internship in Vietnam, and led a bunch of dev communities. Right now I'm Vice President of the 17th KNU CSE Student Council Do:IT.
Tech I work with day to day:
- Java / Spring Boot
- Node.js / TypeScript
- Docker / Kubernetes
- MySQL / PostgreSQL
- AWS / GitHub Actions
- RabbitMQ / Redis
Education
Kyungpook National University
B.S. in Computer Science & Engineering
Mar 2023 — Feb 2027 (Expected)
02. Work Experience
Backend Developer
@ DataHouse VietnamJan 2026 — Feb 2026 · Da Nang, Vietnam
- Developed backend systems using Node.js and TypeScript
- Built TechTalk Hub: Slack-based voting & scheduling chatbot
- Optimized database queries, reducing response time by 38%
Full-Stack Developer
@ Rond CorporationMay 2025 — Dec 2025 · Seoul, South Korea
Youth Startup Academy Selected Company
- Developed web applications as a full-stack developer
- Participated in government-backed startup program
DevOps Technical Lead
@ Happy AgingJul 2024 — Mar 2025
- Led development of elderly fall prevention assistant service
- Implemented AI-based home hazard detection using OpenAI APIs
- Built Android application with Kotlin
- Deployed on AWS EC2 with Docker containerization
DevOps Engineer / Server Developer
@ StocodiJun 2023 — Mar 2024
- Designed real-time stock data processing infrastructure
- Processed live data for 3000+ stocks (KOSPI & KOSDAQ)
- Migrated monolithic architecture to MSA
03. Projects
Featured
Real-time Stock Data Pipeline
Real-time price pipeline for 3000+ KOSPI/KOSDAQ stocks. Rewrote the whole thing from a monolith to MSA because the old system just couldn't keep up.
Problem
Legacy monolithic system couldn't handle real-time data for thousands of stocks simultaneously.
Solution
Redesigned as MSA using Spring Webflux for reactive processing, RabbitMQ for message queuing, and InfluxDB for time-series data.
Impact
Successfully handled 3000+ concurrent WebSocket connections with sub-second latency.
- Spring Webflux
- RabbitMQ
- InfluxDB
- WebSocket
- Docker
Other Noteworthy Projects
Fall Prevention Assistant
AI-powered service that analyzes home images to detect fall hazards for elderly. Includes health surveys and generates personalized safety reports.
- Spring Boot
- Kotlin
- OpenAI
- AWS
KNU Student Council System
Integrated management system for 2000+ students. Features SSO authentication, QR-based student ID verification, and admin dashboard.
- Spring Boot
- Thymeleaf
- MySQL
- Docker
Locker Management System
Web service for managing university department lockers. Built physical server infrastructure with SSL, firewall, and Docker containerization.
- Spring Boot
- Nginx
- Ubuntu
- Docker
04. Honors & Leadership
Honors & Awards
ROND 11th Cohort
Research Officers for National Defense
2024Mili-Tech Challenge 2025
Grand Prize (Minister of Science & ICT Award)
2025TOPCIT 22nd Assessment
1st Place (Score: 805) - President's Award
2025National Science & Engineering Scholarship
Korea Student Aid Foundation
2024WFK ICT Volunteer Corps
NIA Director's Award - Indonesia
2024Leadership
Vice President
KNU CSE 17th Student Council Do:IT
2026 - PresentBackend Officer
LikeLion University (3 years)
2023 - 2025Backend Core Member
GDG on Campus KNU
2024 - 2025Backend Officer
9oormthon Univ KNU
2024 - 202505. Let's Talk
Always down for interesting conversations — whether it's a project idea, a job opportunity, or just a random hello. Drop me a line.
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