Vertical slice architecture vs Screaming architecture

Vertical Slice Architecture and Screaming Architecture are both architectural patterns aimed at promoting modularity, maintainability, and flexibility in software development, but they differ in their approach and focus. Here’s a comparison between the two:

1. Vertical Slice Architecture:

• Focus: Vertical Slice Architecture focuses on organizing code around features or user stories rather than technical layers. Each vertical slice represents a complete feature, encapsulating all the necessary components (presentation, business logic, data access) to implement that feature.
• Organization: Code is organized vertically, with each slice containing all layers of the application stack necessary for the feature it represents.
• Independence: Each vertical slice is self-contained and independent of other slices, allowing features to be developed, tested, and deployed independently.
• Flexibility: Vertical slice architecture promotes flexibility and adaptability by allowing teams to focus on delivering end-to-end functionality for individual features, enabling faster iteration and feedback cycles.

Example: A web application might have vertical slices for features like user registration, product search, checkout, etc.

https://medium.com/@bsvrj9320/vertical-slice-architecture-4c204137e677

2. Screaming Architecture:

• Focus: Screaming Architecture, coined by Robert C. Martin (Uncle Bob), emphasizes a clear separation of concerns and a focus on the core business domain. It advocates for organizing code around the core domain model, with clear boundaries between different concerns.
• Organization: Code is organized around the core domain model, with the most important business concepts at the center of the architecture. External concerns such as frameworks, databases, and user interfaces are kept at the periphery.
• Independence: Screaming Architecture promotes modularity and independence of components by decoupling the core domain model from external concerns. Components within the core domain model are independent and can be easily replaced or extended.
• Flexibility: Screaming Architecture provides flexibility by allowing the core domain model to evolve independently of external concerns. Changes to external concerns have minimal impact on the core domain model.

Example: A web application might have a core domain model representing concepts such as users, products, and orders, with peripheral layers for database access, web frameworks, and user interfaces.

In summary, while both Vertical Slice Architecture and Screaming Architecture aim to promote modularity and maintainability, they differ in their approach to organizing code and managing dependencies. Vertical Slice Architecture focuses on organizing code around features while Screaming Architecture focuses on organizing code around the core domain model. The choice between the two depends on the specific requirements and characteristics of the project.