Backend Dev Guidelines

This guide helps you build backend systems that are reliable and easy to maintain. It covers Node.js, Express, TypeScript, and microservices. You will learn strict rules for organizing code into layers like routes, controllers, services, and repositories. Layered architecture is required. Every error must be sent to Sentry for tracking. No business logic is allowed in routes. A special score called BFRI helps you decide if a change is safe. This skill is for senior engineers who want predictable and observable systems.

Think of it as a rulebook for backend coding. It ensures every piece of code has a clear job. You use unifiedConfig for all settings. Controllers extend BaseController for consistent error handling. The goal is to make your backend easy to test and debug. Anyone working on routes, services, or database access should follow these guidelines.