architecture-paradigm-modular-monolith

# The Modular Monolith Paradigm ## When To Use - Organizing large codebases into well-bounded modules - Teams wanting microservice boundaries without distributed complexity ## When NOT To Use - Already distributed as microservices - Tiny applications where module boundaries add unnecessary complexity ## When to Employ This Paradigm - When you desire team autonomy similar to that of microservices, but without the operational overhead of a distributed system. - When release velocity is slowed by tangled dependencies between internal modules. - When a monolithic architecture is simpler to operate today, but there is a clear need to evolve toward a service-based model in the future. ## Adoption Steps 1. **Identify Modules**: Define module boundaries that align with distinct business capabilities or Bounded Contexts from Domain-Driven Design. 2. **Encapsulate Internals**: Use language-level visibility modifiers (e.g., public/private), separate packages, or namespaces to hide the implementation details of each module. 3. **Expose Public Contracts**: Each module should expose its functionality through well-defined facades, APIs, or events. Forbid direct database table access or direct implementation calls between modules. 4. **Enforce Architectural Fitness**: Implement automated tests that fail the build if forbidden dependencies or package references are introduced between modules. 5. **Plan for Evolution**: Continuously track metrics such as change coupling and deployment s...