Euiyun Kim
Design, build & ship — with AI agents
I take games, web, and mobile products from idea to production end-to-end. I build AI developer tooling — MCP servers and Claude Code skills — and analyze and write about agent-driven workflows.
$ the agents in the background are hand-built too — move your mouse or click · how it works
Textbooks you can
experiment with.
From semiconductors and AI to cars and cameras: Korean interactive textbooks that turn complex ideas into experiments you can run in your browser.
I started building simulators to understand the semiconductor concepts I encountered at work. That curiosity grew into a collection connecting device physics, chip design, manufacturing, computing, and everyday technology.
Predict → change a condition → explain the resultCatalog snapshot · 2026-10-06
Chapter and simulator totals use published book listings.
Unpack an HBM package
Explore DRAM dies, TSVs, and an interposer in 3D.
Edit attention, see what changes
Change attention scores and explore their effect.
Explore transistor structures
Compare planar MOSFET, FinFET, and GAA structures.
Take a smartphone apart
Explore the glass, battery, board, and cameras layer by layer.
What I do
AI Engineering
Integrating AI agents into the development pipeline — building MCP servers, designing Claude Code skills, and automating agent workflows.
Product Engineering
From idea to operating service — planning, frontend, backend, deployment, and SEO, shipped end-to-end.
Games & Interactive
Interactive experiences built on physics and rendering — shipping mobile games and real-time simulations.
Featured projects
mcp-server-xlwings
MCP server for Excel automation — lets AI agents manipulate spreadsheets directly, including DRM-protected files.
AgentGuard
MIT-licensed desktop app for safely configuring which local files coding agents can access, using a visual policy editor.
Writing & blog
Python Ecosystem Together
BookAn online textbook exploring the Python ecosystem on WikiDocs, from fundamentals to practical use. (Korean)
DuckDB in Action
TranslationLocal data analysis with just SQL. Process gigabytes of data in a second on your laptop. (Korean translation)
Vibe Coding Together
BookA guidebook on "vibe coding" — how generative AI and coding agents are reshaping the development landscape. (Korean)
WikiDocs Blog
Tech blog — Claude Code Korean skills and AI-assisted development experience.
Got an interesting problem?
AI tooling, product engineering, collaboration — happy to talk.
geniuskey@gmail.com