Bounded Contexts Aren’t Microservices: How to Draw the Right Boundaries

You can apply Domain-Driven Design correctly and still get your microservice boundaries wrong. That’s because a Bounded Context and a service boundary solve different problems. A Bounded Context defines where a domain model, business language and rules have consistent meaning. A service boundary defines what a service owns and is responsible for operationally. In an ERP system, Human Resources, Payroll and Finance may each be separate Bounded Contexts. But that doesn’t mean each must become its own microservice. Multiple contexts can share a deployment while keeping clear domain boundaries. A single context can also be split across services when scaling, ownership or operational needs justify it. Good boundaries depend on domain cohesion, data and business-rule ownership, independent deployment, scaling needs, and team autonomy. Should every Bounded Context map to one microservice, or can several contexts share a deployable service?

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