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From CRUD to CQRS With Vertical Slice Architecture

🛠️ Workshop Overview

CQRS (Command Query Responsibility Segregation) is often misunderstood as a complex pattern requiring multiple databases, event sourcing, or separate read/write models. However, at its core, CQRS is about structuring your codebase for better maintainability and scalability. Combined with Vertical Slice Architecture, it becomes a powerful way to organize your application around business capabilities rather than technical layers. This workshop will guide you through refactoring a traditional CRUD monolith to a simple, maintainable CQRS-based system using Vertical Slice Architecture, without unnecessary complexity.

📚 Topics

  1. Introduction to CRUD, CQRS, and Vertical Slice Architecture
    • Limitations of traditional CRUD-based systems
    • What is CQRS, and why it’s not just about complexity
    • Introduction to Vertical Slice Architecture and its benefits
  2. Simplifying CQRS
    • CQRS without multiple databases, event sourcing, or separate models
    • Structuring commands and queries for better maintainability
    • How CQRS aligns with business requirements
  3. Vertical Slice Architecture in Action
    • Organizing code around business features, not technical layers
    • Reducing coupling and improving cohesion within slices
    • Building end-to-end features vertically
  4. Refactoring CRUD to CQRS
    • Identifying CRUD operations and breaking them into commands and queries
    • Refactoring a monolith into vertical slices
    • Using MediatR to implement CQRS in .NET
  5. Focusing on the Business
    • Aligning code structure with business capabilities
    • Writing clean, maintainable, and testable code
    • Handling validation, error handling, and cross-cutting concerns
  6. Hands-On Implementation
    • Lab 1: Refactoring a CRUD operation into commands and queries
    • Lab 2: Organizing a feature using Vertical Slice Architecture
    • Lab 3: Implementing CQRS with MediatR in .NET
    • Lab 4: Testing and validating vertical slices
  7. Advanced Topics
    • Scaling CQRS and Vertical Slice Architecture for larger applications
    • Integrating with distributed systems (optional, without overcomplicating)
    • Best practices for maintaining and evolving CQRS-based systems

🎓 Outcomes

  • Understand the core principles of CQRS and Vertical Slice Architecture
  • Be able to refactor a CRUD-based monolith into a CQRS-based system
  • Know how to organize your codebase around business features for better maintainability
  • Gain hands-on experience with MediatR and Vertical Slice Architecture in .NET
  • Learn how to simplify CQRS without unnecessary complexity

🕒 Length: 2-3 days

📩 Contact Me

LinkedIn: https://www.linkedin.com/in/mehdihadeli