system-design-copilot

Mobile-friendly system design interview prep material built with SvelteKit and exported as a static site. The lesson workspace includes a structured in-browser editor, reveal-on-demand sample answers, Mermaid-powered interactive diagrams, decision labs, and a browser-only simulation lab.

See IMPROVEMENTS_PLAN.md for the active product roadmap.

Run locally

Requires Node.js 20.19+ (see .nvmrc).

npm install
npm start

Then open http://localhost:4173/system-design-copilot/ in a browser.

(npm or bun both work; CI uses npm ci.)

Build static output

npm run build

The generated static site is written to dist/ for GitHub Pages (base path /system-design-copilot).

Validate

npm run check
npm test

Attribution

This project adapts selected diagrams and topic framing from The System Design Primer by Donne Martin under CC BY 4.0.