Suppose you want to build an app with a virtual space to hang out with your friends. In real time. Over 3D virtual reality. With a synchronized video playlist. And Karaoke!? 10 years ago, you'd have been laughed out of the room. Today, you'd have plenty of premade opportunities on the web: A-Frame for virtual rooms; Socket.IO for realtime WebSocket communications; TypeScript for cross-stack type safety; React+Next.js for speedy reactive UIs. We'll spend some time together in this talk looking at how to mash all those wonderful pieces of technology together for a stable application. Through that exploration, we'll see how we can take advantage of the web's features -and quirks- to make our client experience feel great.