$ whoami
Taejin Yi
Developer × Finance
ETF LP at a Securities Firm · 15 Years in Dev
Writing code in Yeouido. Building products at the intersection of finance and technology.
View Projects ↓## About
For 15 years, I've been building products across trading systems, mobile apps, and everything in between — bridging development and finance.
Currently working as an ETF Liquidity Provider at a securities firm, where I design and develop ultra-low-latency market-making systems operating at nanosecond precision.
Outside of work, I explore the edges of technology through side projects spanning blockchain fintech, AI apps, and educational services.
## Projects
YEM
In DevelopmentYeouido Exchange Market-making
Ultra-low-latency OMS for ETF Liquidity Providers. Rust-based HFT engine.
Coinluck
BuildingP2P Blockchain Fintech Platform
P2P fintech platform abstracting multiple blockchain providers through a unified interface. Provides wallet management, P2P transfers, credit unions (SOCU), and payment services.
Kimchi Hunter
LiveCEX-DEX Kimchi Premium Auto-Trading
Rust-based trading platform that tracks the kimchi premium between Bithumb and Binance in real-time, capturing spreads through automated grid trading.
끈
App Store ReviewAI Fortune & Compatibility Platform
Social platform combining traditional Korean fortune-telling with AI for relationship compatibility analysis. Features contact-based friend management, AI consultation chat, face reading, and fortune tracking.
Vocaid
App Store ReviewOCR-Powered Vocabulary Learning App
Vocabulary app that captures words from any screen via OCR and provides scientifically-backed spaced repetition learning with the FSRS algorithm. Capture words from Netflix, YouTube, and anywhere else.
APTWallet
BuildingApartment Mortgage P2P Investment Platform
Two-sided marketplace for apartment mortgage P2P investments. Connects borrowers and investors through Google Maps interface powered by official Korean real estate transaction data.