Tutorials Design Patterns in C#
Vertical Slice Architecture Pattern — Complete Guide
Vertical Slice Architecture Pattern — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of Design Patterns in C# on Toolliyo Academy.
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Design Patterns in C# · Lesson 63 of 69
Vertical Slice Architecture Pattern
GoF Core ✓ → Enterprise ✓ → Cloud & Craft
Cloud & Craft · 3 — Microservices & interviews · ~10 min · Module 7: ASP.NET Core Architecture Patterns
What is this?
Vertical slice organizes code by feature (PlaceOrder folder with endpoint+handler+validators) instead of horizontal layers only.
Why should you care?
ShopNest teams change one feature without hunting across Controllers/Services/Repositories folders.
See it live — copy this example
Paste into a C# console or class library project and run dotnet run.
// Features/Orders/PlaceOrder/
// PlaceOrderEndpoint.cs
// PlaceOrderHandler.cs
// PlaceOrderValidator.cs
Console.WriteLine("slice owns its files; shared kernel optional");What happened?
- Each feature is a vertical.
- Share kernels sparingly.
- Complements MediatR.
- Still respect domain boundaries for true cross-feature rules.
Practice next
- Create a PlaceOrder feature folder.
- Colocate endpoint/handler/validator.
- Avoid dumping all shared “helpers” prematurely.
- Add CancelOrder slice beside PlaceOrder.
- Extract a tiny shared Money type.
Remember
Organize by feature. High cohesion per slice. Share deliberately.
ShopNest feature folders
Orders team owns Features/Orders/*.
Outcome: PRs stay localized and reviewable.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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