Modular Monolith: A Practical Architecture Beyond the Microservices Hype

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The microservices trend led many teams to adopt distributed architectures where they were unnecessary, adding complexity and cost without proportional benefit. The modular monolith pattern offers an alternative by organizing a single application into cohesive, well-bounded modules with clear public contracts between them. Each module typically represents a bounded context from Domain-Driven Design, keeping internal components isolated so changes in one module do not break others. An internal event bus paired with the outbox pattern can handle inter-module communication without creating tight coupling or cyclic dependencies. Contrary to a common misconception, the modular monolith is not merely a stepping stone to microservices but a fully viable long-term architecture that makes future service extraction easier if the need ever arises.

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