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hangyulkimmy/README.md

hangyulkimmy.github.io, my portfolio site

hangyulkimmy.github.io is the full version. Below is the short one.

Hi, I'm Hangyul Kim

Every project here started as something I didn't know how to build yet. That's the part I enjoy. Everything below has a live link or runnable code.

hangyulkimmy.github.io · h239kim@uwaterloo.ca · 778-955-2006

Featured projects

Project What it is What it shows Stack
Igloo Classroom · Try it Classroom app with a built-in AI assistant: teachers post assignments, students join by code, the assistant (Claude) manages tasks/calendar and reads uploaded PDFs for due dates. Installable PWA with push reminders. Live with real students. Code private, on request. Accounts & roles, streaming AI with tool use, uploads, email, push Node · Express · Claude API · Web Push · Railway
Shinobi AI Sandbox · Play Turn-based Naruto battle simulator with 48 characters, status effects, clones, and AI opponents that each have a fighting "personality" Game engine design, AI decision scoring, typed state management React 19 · TypeScript · Vite · Tailwind
Coup Online Online multiplayer Coup, 4-letter room codes, bluffing, challenges, refresh-safe rejoin, optional Inquisitor expansion and turn timer Real-time networking, server-authoritative game logic Node · Express · Socket.IO
Igloo Study · Try the tester Test-taking platform for a tutoring service I run: students take level tests in the browser, admins upload/edit tests and review submissions Keeping a real product running for real users; REST API + DB + file storage Node · Express · PostgreSQL · Cloudinary
One Device Mafia · Play Pass-the-phone Mafia party game, no accounts, no second device UX for a shared-screen game, state flow JavaScript · Vite

Games (Unity → WebGL, playable in-browser)

Asteroids · Breakout · Pong · CleanUp Covid · Blackjack (App Lab)

Tech I use

Frontend: TypeScript, React, Vite, Tailwind, vanilla JS/HTML/CSS Backend: Node, Express, Socket.IO, PostgreSQL, REST APIs, Claude API Games: Unity (C#), custom turn-based engines, game AI Tools: Git/GitHub, GitHub Pages, Render, Railway, Cloudinary

Popular repositories Loading

  1. covid covid Public

    CleanUp Covid — a Unity WebGL game

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  2. pong pong Public

    Pong in Unity, playable in the browser (WebGL)

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  3. Breakout Breakout Public

    Breakout clone in Unity, playable in the browser (WebGL)

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  4. asteroids asteroids Public

    Asteroids clone in Unity, playable in the browser (WebGL)

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  5. BlackJack BlackJack Public

    Multiplayer blackjack with betting, built in Code.org App Lab

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  6. igloo-study igloo-study Public

    Test-taking + admin platform for Igloo Study (a tutoring service I run) — Express, PostgreSQL, Cloudinary

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