Building Firebase Quickdraw Multiplayer

Firebase Quickdraw was expanded from a single-player AI drawing game into a multiplayer web app where up to four users can join shareable rooms, draw prompted objects, view one another’s progress, and compete for scores across six rounds. The project uses Firebase Hosting for global static delivery, Realtime Database for low-latency game-state synchronization, Cloud Functions for secure room joining, external handwriting-model calls, leaderboard resets, and cleanup, and Firebase Authentication and Security Rules to limit database access. Development challenges included designing a simple room-based database model, preventing race conditions with transactions, handling abandoned lobbies through Realtime Database’s OnDisconnect feature, and retrofitting security after the initial prototype. The team relied on the Firebase Emulator Suite and Chrome DevTools for isolated local debugging, while Firebase Performance Monitoring and Google Analytics measured load times, API responsiveness, player completion behavior, and audience insights. The account emphasizes that Firebase’s integrated tools reduced infrastructure work and enabled the team to focus on the multiplayer experience, while noting that Vertex AI is now called Agent Platform as of August 2026.

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