A monolithic application, since the entire system runs as a single deployed unit and internal calls happen inside the same process without any extra network overhead.

A microservices architecture, because each business feature is isolated from the others and can be replaced independently without affecting the rest of the system.

A serverless deployment, since the entire application is hosted within a single cloud-managed runtime that scales automatically with the volume of incoming user traffic.

An event-driven architecture, because the load balancer publishes incoming requests as events that the internal features then consume in order through a shared queue.