backend-class-design

Guide backend class design with DDD, SOLID, and layered architecture.

Updated Aug 27, 2026
One-click install
npx skills add https://github.com/kazuho39/kzo-document --skill backend-class-design
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: backend-class-design
Source: https://github.com/kazuho39/kzo-document/tree/main/.github/skills/backend-class-design
Command: npx skills add https://github.com/kazuho39/kzo-document --skill backend-class-design

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps developers create well-structured, maintainable, and scalable backend code by adhering to best practices in class design.

Core Features & Use Cases

  • Object-Oriented Design: Apply SOLID principles, Domain-Driven Design (DDD), and layered architecture patterns.
  • Refactoring Assistance: Identify and refactor anti-patterns like God Classes and Long Methods.
  • Use Case: When starting a new feature, use this Skill to design the core domain entities and their interactions, ensuring a clean and testable architecture from the outset.

Quick Start

Design a new Order class using DDD patterns and SOLID principles.

Frequently Asked Questions about backend-class-design

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I design robust backend classes using SOLID principles and DDD?▼

Robust backend class design applies SOLID principles and Domain-Driven Design to create well-structured, maintainable code. This approach guides new class creation and domain entity interactions, ensuring a clean, testable, and scalable layered architecture from the outset.

What is the best way to refactor a God Class in object-oriented backend code?▼

Refactoring a God Class involves identifying the anti-pattern and applying SOLID principles to split responsibilities. This class design process breaks down large, unwieldy classes into smaller, maintainable domain entities that adhere to a clean layered architecture.

Can I use this class design approach with PHP, TypeScript, and Java?▼

Yes, this class design approach explicitly supports object-oriented languages including PHP, TypeScript, and Java. It provides comprehensive guidance for applying Domain-Driven Design and SOLID principles across these specific backend technology stacks.

How do I structure a new domain entity using layered architecture and DDD?▼

Structuring a new domain entity using DDD involves defining core behaviors and applying a layered architecture to separate concerns. This class design method ensures entities are well-structured, maintainable, and scalable by adhering to SOLID principles.

When should I apply refactoring to fix Long Methods in my backend architecture?▼

You should apply refactoring to fix Long Methods when maintainability drops and classes violate SOLID principles. This class design guidance identifies such anti-patterns and restructures them into clean, testable domain components.