When choosing between REST and message brokers, why do you choose one technology over the other, and how do you justify your choice for a specific task?

The choice between REST and message brokers depends on system requirements:

• REST is suitable for synchronous interactions, where the client requests data and expects a response. It is a simple and widely supported protocol for CRUD operations and direct request-response services.

• Message brokers (e.g., RabbitMQ, Kafka) are used for asynchronous communication, ensuring reliable delivery, scalability, event processing, and decoupling of components.

Arguments for the choice:

• If the task requires instant response and simplicity — REST.
• If high load, queue processing, event-driven architecture, or service offloading are important — message broker.
• For integrating microservices with varying degrees of coupling and asynchrony — brokers.

For example, to retrieve user data on request — REST. For processing orders in a queue and subsequent handling — message broker.