About this demo
This visualiser animates the core CQRS flow: a write model accepts commands, validates them, and appends events to an event store. Each event is published onto an event bus and fanned out to independent projection workers, each maintaining its own optimised read model — whether a search index, an aggregation, or a reporting cache.
The key insight CQRS delivers is that query load never competes with write throughput. Read models can be rebuilt from the event log at any point, and new projections can be added without touching the write path. In high-traffic systems this separation is what allows each side to scale independently.