What this site is
This is a working notebook for systems I actually run: AI-assisted developer tooling, data pipelines, and the market-data infrastructure behind a trading system I built and operate.
What gets written here
- Teardowns of things that broke. Reconnect logic for a market-data WebSocket that silently dropped sequence numbers. Backtests that looked great until a look-ahead bug surfaced. The failure is the interesting part.
- Tool comparisons with numbers attached. Data API latency and coverage measured on the same workload, not copied from marketing pages.
- LLM workflow design. How context gets assembled, where hallucinations show up, and what verification step catches them.
What does not get written here
No stock picks, no target prices, no returns screenshots. The systems described here read market data and run analysis; the trading decisions are mine and stay out of the writing. That is a deliberate boundary, not a legal hedge — the engineering is the transferable part, and the strategy parameters are not.
Stack
The site is Astro on Cloudflare Pages, bilingual (English and Korean) from the first post. Source for the tooling shows up inline where it is useful.