Jonathan Harford

A production-grade multiplayer web application digitizing the party game “Eat Poop You Cat,” serving real-time collaborative gameplay with sophisticated user-generated content management.

• Stack: Svelte 5 with SvelteKit 2, TypeScript, Supabase with Prisma ORM
• Background processing: Postgres job queues handling game expiration, turn timeouts, and email notifications
• Authentication and security: Clerk integration with custom middleware, role-based access control
• Caching strategy: Multi-tier HTTP caching with ETags, CDN optimization, and conditional requests
• Testing strategy: Comprehensive test suite, including Playwright E2E and Vitest unit tests

A SvelteKit-powered playground built to stress-test an AI's consistency by lying to its face. By surgically editing any past message in a conversation thread, you can force the model to reconcile a "false history" and watch it either cope, contradict itself, or (if it knows the game) call out your gaslighting. It’s a fun, technical probe into model psychology that turns context-window debugging into a high-stakes game of memory manipulation.

A wellness tool for Android and iOS that helps users guide their mind using brainwave entrainment—a scientifically supported method that uses sensory stimulation to influence the brain's natural rhythms.

By presenting the user's brain with precise audio and light patterns, the app helps them shift into a more focused, relaxed, or restful state.

A high-performance 3D simulator that reimagines the traditional Hanukkah game with a synthwave aesthetic.

Leveraging Babylon.js and Havok physics for authentic spinning mechanics, the app features dynamic camera tracking, haptics, and a complete single-device multiplayer suite with customizable rules and score tracking.

As the sole developer, I engineered the full stack, delivering an accessible, retro-futuristic experience both on web and iOS/Android via Capacitor for celebrants who miss a physical dreidel.