Backend .NET – Clean Architecture + CQRS

Guide for creating and maintaining .NET 10 backends with Clean Architecture, CQRS (MediatR), and Features organization (vertical slice).

When to use

• Add a new feature (new entity + CRUD or operations).
• Add a Command or Query to an existing feature.
• Create Controller, Handler, Validator, Repository, or UnitOfWork.
• Configure HTTP integration (Refit + Http.Resilience).
• Review or refactor code to follow this skill's pattern.

When not to use

• Projects that do not use CQRS or MediatR.
• Simple minimal APIs without layered architecture.
• Codebases that use EF Migrations instead of FluentMigrator.
• Projects that already follow a different, established backend pattern.