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BenjaminG
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backend-developer

Guide TypeScript backend design with clean architecture and NestJS patterns.

3|Updated Feb 3, 2026
Search Tags:#testing#architecture#TypeScript#backend#SOLID#NestJS#analyze
One-click install
npx skills add https://github.com/BenjaminG/ai-skills --skill backend-developer-benjaming
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: backend-developer
Source: https://github.com/BenjaminG/ai-skills/tree/main/backend-developer
Command: npx skills add https://github.com/BenjaminG/ai-skills --skill backend-developer-benjaming

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides structured guidance for designing, implementing, and evolving TypeScript backends (NestJS, APIs, databases) with clean architecture, SOLID principles, and robust testing and deployment practices.

Core Features & Use Cases

  • Layered architecture guidance: controllers → services → repositories → models with dependency injection.
  • NestJS-focused patterns: controllers and services separation, module-based structure, and interfaces for repositories and external services.
  • TypeORM and data access patterns: entity-first design, repositories, and query builders for type-safe data access.
  • Use Case: design a new API that handles user accounts with authentication, persistence, and testing.

Quick Start

  • Create a new NestJS project with strict TypeScript configuration and a modular structure.
  • Refactor existing code to adhere to the layered architecture (controllers → services → repositories → models) and apply dependency injection.
  • Add sample unit tests and CI configuration to ensure ongoing quality.

Frequently Asked Questions about backend-developer

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

FAQPage Schema
How do I build a scalable TypeScript backend with clean architecture?▼

Build a scalable TypeScript backend by applying a layered architecture pattern of controllers, services, repositories, and models. This structure separates business logic from data access, enabling maintainable API servers and microservices using NestJS.

What is the best way to structure a NestJS API for maintainability?▼

The best way to structure a NestJS API for maintainability is using a module-based architecture with clear separation between controllers and services. Implement dependency injection and define interfaces for repositories and external services to ensure loose coupling.

Does this backend architecture approach support TypeORM for data access?▼

Yes, this architecture approach supports TypeORM for data access by utilizing an entity-first design pattern. It leverages repositories and query builders to provide type-safe database interactions within your TypeScript application.

How do I apply SOLID principles and dependency injection in a Node.js API?▼

Apply SOLID principles in a Node.js API by enforcing strict TypeScript configurations and using dependency injection across your codebase. This design isolates components, making your backend layers easier to test and independently evolve.

Why does my NestJS project need layered controllers, services, and repositories?▼

Your NestJS project needs layered controllers, services, and repositories to properly isolate API request handling, business logic, and data persistence. This separation enforces clean architecture boundaries and makes the codebase easier to unit test.

Can I use this approach to refactor an existing Node.js application?▼

Yes, you can use this approach to refactor an existing Node.js application by migrating its code into a modular NestJS structure. Reorganize the logic into layered components and apply dependency injection to align with strict TypeScript standards.

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