$ 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
VISION
In DevelopmentVanguard and Intelligent Self-neutralizing Intermarket Order Nexus
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 ReviewTraditional Fortune-Telling AI Compatibility Platform
Social platform combining traditional Korean fortune-telling (Saju) with AI for relationship compatibility analysis. Features contact-based friend management, AI consultation chat, face reading, and fortune tracking. Currently in Android open beta.
끈톡
BuildingMood-Based AI Social Matching Platform
Social platform where AI recommends people matching your current mood and connects you through AI-mediated chat. Combines MBTI and AI vision first-impression analysis for optimal matching.
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.
닥톡
BuildingYour body's recorder, your doctor's translator
Health platform that closes the doctor-patient information gap through AI symptom triage and automatic summarization of clinical visit recordings. Offers pre-visit symptom consultation, post-visit comprehension support, and a personal health timeline.