event-driven-architect

Designing an event-driven architecture for microservices involves using an event bus for pub/sub communication and domain events, allowing services to react to changes independently without direct service-to-service calls.

Separating read and write operations is best achieved using CQRS, which splits your system into optimized read models and command-based write models to improve performance and scalability.

Event sourcing works by storing system state as a sequence of immutable domain events. You reconstruct the current state by replaying these events through aggregate handlers, ensuring robust asynchronous state management.

You need pub/sub patterns when building decoupled systems like e-commerce platforms, enabling actions such as order creation to trigger inventory and analytics updates asynchronously through an event bus.

Yes, you can use CQRS and event sourcing together to build scalable applications. Writing commands generates immutable events that update the write model, while asynchronous handlers project these events into optimized read models.

Using domain events instead of direct service-to-service calls facilitates asynchronous communication, preventing cascading failures and allowing independent services to scale and react to business changes without tight coupling.