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.