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Module Based

Structure systems as modules with clear boundaries and contracts.

Intent

Reduce coupling by isolating functionality into modules.

When to use

  • Codebase is growing and needs structure.
  • Multiple teams or tools share components.
  • You want reusable building blocks.

Core mechanics

  • Define module boundaries and interfaces.
  • Enforce dependency rules.
  • Test module contracts independently.

Implementation checklist

  1. Identify module responsibilities and owners.
  2. Define interfaces and shared contracts.
  3. Document dependency rules.
  4. Add integration tests for module boundaries.
  5. Review coupling and refactor regularly.

Failure modes and mitigations

  • Hidden coupling -> enforce interface boundaries.
  • Circular dependencies -> keep dependencies acyclic.
  • Unclear ownership -> assign module owners.

Observability and validation

  • Module dependency graph.
  • Contract test coverage.

Artifacts

  • Module architecture diagram.
  • Interface documentation.
Seen in production

Seen in production as

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