No Waiting

A bilingual campus app that streams live queue length and occupancy for university restaurants, cafeterias and gyms, estimates the wait from throughput, and maps a walking route to whichever venue is quietest right now.

Its reminder system encodes each user's thresholds into Firebase Cloud Messaging topic names, so scheduled Cloud Functions evaluating occupancy every two minutes can fan alerts out to every matching subscriber in a single publish instead of per-user sends.