Clean Architecture, DDD & CQRS

Building scalable, testable, and maintainable systems through Clean Architecture, Domain-Driven Design, and CQRS principles.

I design software with architecture first in mind — ensuring every layer of the system has a clear purpose, boundaries, and direction.
Using Clean Architecture, Domain-Driven Design (DDD), and CQRS, I help teams build .NET systems that are robust, scalable, and easy to evolve over time.

Why Architecture Matters

Many projects start fast but slow down as they grow. The real challenge isn’t writing code — it’s keeping it maintainable.
Clean Architecture and DDD bring clarity, structure, and agility by separating business logic from frameworks and infrastructure.
CQRS complements these principles by dividing reads and writes, making systems more predictable, performant, and testable.

Core Areas of Expertise

  • Clean Architecture: Layered separation into API, Application, Domain, and Infrastructure projects.
  • DDD Principles: Entities, Value Objects, Aggregates, Domain Events, and Bounded Contexts.
  • CQRS (Command Query Responsibility Segregation): Distinct command and query pipelines using MediatR or custom patterns.
  • SOLID & Design Patterns: Applying single responsibility, dependency inversion, and composition over inheritance.
  • Event-Driven Design: Using domain events and handlers for decoupled communication.
  • Testing Architecture: Unit testing the domain layer, integration testing the application layer.
  • Refactoring Legacy Systems: Incrementally adopting Clean Architecture in existing .NET solutions.
  • Documentation: Architecture Decision Records (ADRs) and UML diagrams for stakeholder clarity.

Typical Deliverables

  • Full .NET solution structured around Clean Architecture (API → Application → Domain → Infrastructure).
  • CQRS-based workflow for complex business operations.
  • Domain event pipeline integrated with MediatR and logging.
  • Sample test suite covering domain rules, commands, and queries.
  • Visual documentation and architecture summary for teams.

Tools & Frameworks

  • ASP.NET Core · EF Core · MediatR · AutoMapper · FluentValidation · Serilog
  • xUnit · Moq · Testcontainers · GitHub Actions (CI/CD)
  • PlantUML / Excalidraw for architecture visualization

Design Philosophy

  • Boundaries are freedom: Each layer knows only what it must.
  • Code reflects language: Domain models mirror real-world concepts.
  • Simplicity wins: Avoid over-engineering — clarity beats cleverness.
  • Test the core: The domain should survive framework changes.

I apply these architectural patterns in every serious .NET project I deliver — from task management systems to CRMs and SaaS platforms.
My goal is always the same: deliver code that’s clean, extendable, and understandable to every developer who works on it next year.

See It in Action:

Tech Stack: ASP.NET Core 8 · EF Core 8 · MediatR · DDD · CQRS · SOLID · Azure