Building Scalable Backends with DDD & Domain Events .NET C#

Short summary

This article presents refined architectural patterns for .NET backends: aggregates with read-only state exposure to enforce business rules, domain events that decouple workflow reactions from core logic, and value objects replacing primitives with explicit, validated types. Core insight: most scalability and maintainability problems originate from poor coupling and boundary design long before infrastructure becomes a bottleneck. For modular monoliths, MediatR provides loose coupling without introducing distributed-system complexity prematurely.

• •Aggregates should expose read-only state access to prevent external code from bypassing business rules
• •Domain events decouple workflow reactions from aggregates, reducing coupling and improving maintainability
• •Value objects replace primitives with explicit, validated types that centralize domain logic

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