How Domain Boundary Violations Slowly Destroy Your Codebase
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Domain boundary violations occur when services directly manipulate or depend on each other's internals, creating circular dependencies, fragile dependency graphs, and untestable code. Using NestJS as a concrete example, the post walks through real symptoms like widespread `forwardRef()` usage, duplicate provider declarations, and fragmented orchestration logic. The prescribed fix is introducing an orchestration layer (e.g., `LeadLifecycleService`) that owns all cross-domain coordination, while individual domain services remain focused on their own invariants and CRUD operations — resulting in an acyclic, testable, and maintainable architecture.
