Theo Park

@theo

Software engineer who ships ideas as videos, code, and ebooks. AI tools, dev infra, and a small problem with mechanical keyboards. NYC.

AI projects I've shipped

Open-source things I built — most have a YouTube episode walking through the code.

tiny-gpt — a GPT in 300 lines of NumPy

Following Karpathy's nanoGPT, stripped further. Two-hour video walks through the math.

pr-agent — Claude that ships pull requests

Agent reads a GH issue, writes the patch, opens the PR. Bring your own keys.

substack-rag — chat with my own writing

Self-hosted retrieval over my Substack archive. Open source the day after each episode.

embeddings playground

Drop any text. Watch the 1024-d vectors collapse to 2D and cluster. Browser-only.

eval-harness — minimal LLM evals you can read

A 200-line eval harness that doesn't pretend to be Weights & Biases.