Goal: Design and develop a high-performance, fully decoupled component architecture RESTful API for a data management system based on the Node.js platform and PostgreSQL database. What has been done within the project: Designed using the Separation of Concerns template: The application logic has been fully divided into independent layers following the Controller-Service-Repository pattern. This ensures easy scalability of the system and isolation of the database layer. Development of Router and Controller layers: Configured HTTP routing, implemented validation of incoming requests, and orchestrated API workflows without code overload. Implementation of business logic (Service Layer): Created an isolated layer of business rules for the application, independent of framework specifics or external libraries. Data handling (Repository Layer): Wrote optimized asynchronous SQL queries to PostgreSQL to ensure a complete CRUD (Create, Read, Update, Delete) lifecycle for records. Security and stability: Integrated global asynchronous error handlers that prevent server crashes during critical failures and ensure proper closure of database connections. Project results in numbers: Created a high-load-ready backend framework, where the response time to requests (API Response Time) is less than 0.15 seconds. The architecture allows for database expansion and changes in storage logic without the need to rewrite the system's business rules. The code fully meets the requirements for secure handling of commercial data and is ready for integration with any modern frontend (React, Angular, Vue). Need to develop a reliable backend architecture for your startup, write an API, integrate a database, or optimize complex code? Message me privately — I will analyze your task for free and suggest the optimal technical structure for your business!