Event-Driven Architecture
In an event-driven architecture, components communicate by publishing and listening to events ("order created", "payment confirmed") instead of calling each other directly. Each service can evolve, fail, or be replaced without blocking the others.
This pattern shows up often on SaaS platforms that need to connect several third-party services: when an order is created, an event can trigger a confirmation email, a stock update, and a call to the payment provider in parallel, with none of the three depending on the others. It also helps absorb traffic spikes, since each event can be processed as soon as capacity is available instead of making the user wait for everything to finish.
The main risk is debugging complexity: when one action triggers a chain of events spread across several services, tracing what happened after a failure gets hard without the right tooling (traceability, monitoring, handling of failed events). This pattern is best reserved for systems that genuinely need that decoupling, with a plan from day one for how event flows will be observed and debugged.
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