Domain Architecture (DDD)

Responsibilities

• Define bounded contexts and domain ownership.
• Keep domain invariants stable while allowing evolution.
• Prevent tight coupling via anti-corruption layers.

Key interfaces

• Domain APIs and contracts between contexts.
• Event schemas and integration contracts.
• Shared language glossary and decision logs.

Operational signals

These are the measurements that tell you whether this layer is healthy in production.

• Change failure rate by domain boundary.
• Cross-service dependency depth and coupling indicators.
• Incident attribution by bounded context.

Failure modes

• Monolith-by-accident via shared tables and shared mutable models.
• Leaky abstractions that spread domain rules everywhere.
• Unowned integration points that silently break.

Production readiness checklist

• Document context maps; enforce ownership in code review.
• Keep integrations explicit via events/contracts.
• Build contract tests for cross-context interfaces.