Selected decisions and outcomes from systems I designed, built, and operated.
Solo full-stack design and development
Automated Korean and US stock trading where LLM agents in distinct roles split the work from research to order placement
KIS and Kiwoom automated trading built on a four-stage SimplifiedRunner with LangGraph Planning and Session Graphs on top. Zero Trust three-network isolation and staged BACKTEST→PAPER→CANARY→LIVE rollout.
A personal knowledge base RAG that Claude searches and indexes directly through MCP tools
A personal RAG that exposes Elasticsearch hybrid search (BM25+kNN+RRF), BGE reranking, and a concept graph to Claude through 14 MCP tools.
AIOFARM / Design and overall development lead
The central Django backend for on-premises AI sorting systems at 20+ sites nationwide
An on-premises backend handling 30+ sorting requests per second with 8 Django apps, 5 Celery queues across 3 worker pools, and PostgreSQL RANGE partitioning.
AIOFARM / PLC middleware design and development
Modbus TCP PLC communication middleware with four separated layers and a dedicated Celery polling worker
Four separated layers (Celery / Service / Modbus / Repository) and a dedicated polling worker collect data from up to 64 sorting outlets every 10 seconds.
AIOFARM / System architecture design and development
A real-time GPU inference pipeline over 8 cameras plus a per-produce machine vision library
A torch.multiprocessing capture-inference-MV-transfer pipeline, paired with a standalone vision library package built on a BaseProcessor abstraction.
AIOFARM / Planning and build lead
Remote monitoring of 20+ field sites, automated anomaly data collection, standardized CI/CD and deployment, GitHub-Slack-Notion webhook integration
Four-part operations infrastructure: Prometheus + Grafana monitoring, FastAPI anomaly collection, GitHub Actions + Docker Compose deployment, and a GitHub-Slack-Notion integration webhook.
AIOFARM / Frontend architecture and development lead
A React + Electron desktop app running in kiosk mode on site
A React + Electron kiosk app holding 60fps on industrial PCs through virtual scrolling, adaptive polling, and monolith decomposition.
AIOFARM / Backend architecture design and development
A four-phase port moving Flask Blueprints to Django + DRF and splitting the database
A four-phase port from Flask Blueprints to Django + DRF, splitting MySQL into PostgreSQL + MongoDB, alongside security fixes and a standardized three-layer architecture.
AIOFARM / Engineering culture lead
Leading the rollout of Git Flow, architecture docs, pre-commit, and Storybook across a five-person team
Established Git Flow with PR review, an architecture document set, a pre-commit quality system, and a Storybook component development environment across a five-person team.
EasyAI / Software development
An early prototype of an image-AI produce quality prediction system
An early produce AI sorting prototype built with Python, OpenCV, and PyTorch. It became the foundation for the systems built after the AIOFARM spin-off.