👋 Moin, I'm Jonas Pfalzgraf

I'm a passionate Full-Stack Developer with a strong focus on the web
platform. I work with C# .NET, TypeScript, Node.js, Vue,
Svelte, Angular, SASS, Rust, and PHP — building everything
from sleek web apps to desktop and mobile solutions.

Open source is close to my heart. I believe in sharing knowledge, building tools
others can rely on, and making the web a better, more open place — one commit at
a time.

🚀 What I'm Working On

Here's a taste of what your support helps me build and maintain:

🛠️ bQuery.js

The jQuery for the modern Web Platform.

bQuery.js is a slim, TypeScript-first DOM library that brings back the
simplicity and directness of jQuery's workflow — but built for the web of today.
It combines reactive bindings, Web Components support, and motion utilities,
all without a mandatory build step.

Why it matters: Many developers still reach for jQuery because it's simple
and direct. bQuery gives them that familiar experience while embracing modern
browser APIs, making it a great fit for lightweight projects, prototypes, and
progressive enhancement.

• ✅ TypeScript-first, zero mandatory build step
• ✅ Reactivity & Web Components support
• ✅ Motion utilities built in
• ✅ Works right out of the box

→ GitHub Repository

♟️ CheckAI

A Chess Server built for AI Agents — written in Rust.

CheckAI is a Rust application that provides both a terminal interface and a
REST + WebSocket API for playing chess. It's designed specifically for AI
agents to play against each other, following the FIDE 2023 Laws of Chess.

Why it matters: As AI agents become more capable, having a rigorous,
standards-compliant chess environment with a clean JSON protocol is invaluable
for testing and benchmarking AI decision-making. CheckAI provides exactly that
— self-contained, fast, and easy to integrate.

• ✅ Complete chess engine — castling, en passant, promotion, check/checkmate,
  stalemate, 50-move rule, threefold repetition, insufficient material
• ✅ REST API with full JSON protocol for AI agents
• ✅ Real-time WebSocket API with push notifications and game subscriptions
• ✅ Swagger/OpenAPI docs auto-generated at /swagger-ui/
• ✅ Interactive terminal interface for local two-player games
• ✅ Cross-platform with one-line install scripts for Linux, macOS & Windows
• ✅ Self-update mechanism built in

→ GitHub Repository

💡 Other Projects I Maintain

Beyond my featured work, I also actively maintain a range of open-source tools:

• 🎬 user-enable-pip — A
  browser userscript that restores Picture-in-Picture on sites that disable it.
• 📦 Sort-it-now — A 3D box
  packing optimizer with interactive visualization.
• 🔒 QRify — A simple,
  privacy-first QR code generator. No tracking, no login, no subscription.
• 🌐 Corsify-proxy — A proxy
  API that adds CORS headers to Atom and RSS feeds.
• 🧩 BrowserExtensionTemplate
  — A clean SASS + TypeScript starter for building browser extensions.

💝 How Your Sponsorship Helps

Building and maintaining open-source software takes real time and energy. Your
support helps me to:

• ⏱️ Dedicate more time to open-source projects
• 🔧 Improve and maintain existing tools that people actually use
• 🌱 Start new projects that fill real gaps in the ecosystem
• 📝 Write better documentation so everyone can get started quickly
• ☕ Keep the coffee flowing (this one is non-negotiable)

Every sponsorship — no matter the size — makes a genuine difference and signals
that the work I do is valued. Thank you so much! 🙏

🤝 Let's Connect

I'm always happy to chat about tech, collaborate on ideas, or just geek out
about the latest in web development.

• 🌍 Website: josunlp.de
• 💼 LinkedIn: jonas-pfalzgraf
• 🐘 Mastodon: @JosunLP@chaos.social
• 🦋 Bluesky: josunlp.de
• 📺 YouTube: JosunLP
• 🎮 Twitch: josunlp

"Code is like humor. When you have to explain it, it's bad." — Cory House