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This skill provides a comprehensive library of industry-standard backend patterns and implementation guides to help developers build scalable, maintainable server-side applications. It covers architectural layers such as Repository and Service patterns, RESTful API design, database efficiency techniques like N+1 query prevention, and robust security measures including JWT authentication and Role-Based Access Control (RBAC). Whether you are setting up a new Next.js project or optimizing a Node.js microservice, this skill ensures your backend follows professional best practices for performance and reliability.