How would you design a CQRS + Event Sourcing system in .NET Core?
Updated Apr 28, 2026
Short answer
Design a CQRS + Event Sourcing system in ASP.NET Core by separating read and write models, storing domain events as the source of truth, and rebuilding application state from event streams.
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Deep explanation
CQRS (Command Query Responsibility Segregation) and Event Sourcing are architectural patterns commonly used in scalable and distributed systems.
Together they provide:
- High scalability
- Auditability
- Temporal history
- Event-driven integration
- Better separation of concerns
Common technologies include:
- Apache Kafka
- RabbitMQ
- EventStore
- Microsoft SQL Server
- MongoDB
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1. Understand CQRS
CQRS separates:
Commands (Write Side)
Commands modify state.
Examples:
- CreateOrder
- CancelOrder
- UpdateInventory
Commands should:…
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