Jan 20
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Event-driven architecture is a pattern where services communicate by publishing and consuming events instead of calling each other directly. When something important happens, a service emits an event. Other services react to that event asynchronously. This removes direct dependencies between services. This pattern improves scalability and resilience. Services do not wait for responses and are not affected if consumers are temporarily unavailable. Events can be processed when resources are available. Event-driven systems are ideal for workflows, notifications, analytics, and integrations. However, debugging becomes harder because execution is distributed and asynchronous. Observability, idempotency, and proper error handling are critical. Without them, event systems can become unreliable and difficult to maintain. In interviews, experienced developers are expected to explain when to use events instead of synchronous calls, what problems event-driven architecture solves, and what new challenges it introduces. This shows architectural maturity.