Syllabus

Clean Architecture & DDD Mastery

1. Architectural Patterns
The Evolution of Architecture: Monolith to Clean Onion Architecture: Dependency Inversion at the core Clean Architecture: The 'Screaming' architecture Hexagonal Architecture (Ports and Adapters)
2. Domain-Driven Design (DDD) Foundations
Ubiquitous Language: Aligning code with business Entities vs Value Objects: Managing identity and state Aggregates & Aggregate Roots: Defining consistency boundaries Bounded Contexts: Handling complexity in large domains
3. Advanced DDD Patterns
Domain Services: When logic doesn't fit in an entity Domain Events: Decoupling side effects via events Repositories: Mediating between domain and data Unit of Work: Ensuring atomic transactions
4. Implementing the Clean Layers
The Domain Layer: Zero dependencies, pure C# The Application Layer: Orchestrating use cases The Infrastructure Layer: Bridging to the outside world The Presentation Layer: Decoupling the UI from logic
5. Patterns for Data & Logic
CQRS (Command Query Responsibility Segregation) MediatR: Implementing the Mediator pattern in .NET Specification Pattern: Encapsulating business rules Policy Pattern: Handling complex authorization rules
6. Enterprise Domain Challenges
Handling Persistence Ignorance with EF Core Mapping Layers: AutoMapper vs Manual Mapping Validation Strategies: FluentValidation in the App Layer Error Handling: Result patterns vs Exceptions
7. Testing Clean Architecture
Unit Testing the Domain: Fast and pure Testing Use Cases with Mocks Integration Testing the Infrastructure ArchUnit .NET: Enforcing architectural rules via tests
8. Real-World Case Study
Refactoring a 'Spaghetti' Monolith to Clean Architecture DDD in Action: Modeling a complex Logistics system
Clean Architecture & DDD Mastery
Lesson 30 of 30 100% of course

DDD in Action: Modeling a complex Logistics system

17 · 8 min · 5/23/2026

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DDD in the Real World

The Challenge: A logistics platform with complex rules for shipping, customs, and dynamic pricing across 50 countries.

1. Modeling the Aggregates

We modeled the **Shipment** as the Aggregate Root. It contained **Packages**, **CustomsDeclarations**, and **TrackingEvents**. We enforced a rule: A shipment can't leave its current 'Zone' if the customs declarations are incomplete. This logic stayed 100% in the Domain Entity.

2. Bounded Context Isolation

We split the system into three contexts: **Fleet Management**, **Order Fulfillment**, and **Customer Billing**. We used **Domain Events** to notify Billing when a shipment was delivered. This meant the Billing logic didn't care about 'Trucks' or 'GPS coordinates'—it only cared about the ShipmentDeliveredEvent.

3. The Outcome

The business was able to launch in 10 new countries in just 2 months because the 'Customs Rules' were encapsulated in small, testable **Policy** objects that could be swapped per country. This is the ultimate proof of DDD: It makes the software as flexible as the business needs to be.

CLEAN ARCHITECTURE & DDD MASTERY COMPLETE.

You now possess the tools to build software that lasts for decades. Go forth and build clean!

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Clean Architecture & DDD Mastery

On this page

1. Modeling the Aggregates 2. Bounded Context Isolation 3. The Outcome CLEAN ARCHITECTURE & DDD MASTERY COMPLETE.
1. Architectural Patterns
The Evolution of Architecture: Monolith to Clean Onion Architecture: Dependency Inversion at the core Clean Architecture: The 'Screaming' architecture Hexagonal Architecture (Ports and Adapters)
2. Domain-Driven Design (DDD) Foundations
Ubiquitous Language: Aligning code with business Entities vs Value Objects: Managing identity and state Aggregates & Aggregate Roots: Defining consistency boundaries Bounded Contexts: Handling complexity in large domains
3. Advanced DDD Patterns
Domain Services: When logic doesn't fit in an entity Domain Events: Decoupling side effects via events Repositories: Mediating between domain and data Unit of Work: Ensuring atomic transactions
4. Implementing the Clean Layers
The Domain Layer: Zero dependencies, pure C# The Application Layer: Orchestrating use cases The Infrastructure Layer: Bridging to the outside world The Presentation Layer: Decoupling the UI from logic
5. Patterns for Data & Logic
CQRS (Command Query Responsibility Segregation) MediatR: Implementing the Mediator pattern in .NET Specification Pattern: Encapsulating business rules Policy Pattern: Handling complex authorization rules
6. Enterprise Domain Challenges
Handling Persistence Ignorance with EF Core Mapping Layers: AutoMapper vs Manual Mapping Validation Strategies: FluentValidation in the App Layer Error Handling: Result patterns vs Exceptions
7. Testing Clean Architecture
Unit Testing the Domain: Fast and pure Testing Use Cases with Mocks Integration Testing the Infrastructure ArchUnit .NET: Enforcing architectural rules via tests
8. Real-World Case Study
Refactoring a 'Spaghetti' Monolith to Clean Architecture DDD in Action: Modeling a complex Logistics system