// BUILDING DESIGN AND BUILD A PROGRESSIVE SET OF NODE.JS BACKEND PROJECTS, STARTING FROM BEGINNER-FRIENDLY MINI PROJECTS AND EVOLVING INTO FULL PRODUCTION-GRADE APPLICATIONS, COVERING CORE NODE.JS CONCEPTS, PROJECT STRUCTURE, EXPRESS OR FASTIFY SETUP, ROUTING AND MIDDLEWARE, AUTHENTICATION AND AUTHORIZATION, SESSION AND TOKEN HANDLING, ROLE-BASED ACCESS CONTROL, ROUTE GUARDS, FILE UPLOAD AND STATIC FILE SERVING, LOGGING AND MONITORING, CENTRALIZED ERROR HANDLING, VALIDATION, SECURITY BEST PRACTICES, RATE LIMITING, CORS AND HEADERS, DATABASE DESIGN AND INTEGRATION (SQL AND NOSQL), MIGRATIONS AND SEEDING, BACKGROUND JOBS AND QUEUES, CACHING, TESTING, API DOCUMENTATION, DOCKER-BASED LOCAL DEVELOPMENT, DOCKER COMPOSE ORCHESTRATION, ENVIRONMENT CONFIGURATION, PRODUCTION CONTAINER BUILDS, DEPLOYMENT TO AWS (EC2, ECS, OR MANAGED SERVICES), SECRETS MANAGEMENT, SCALABILITY PATTERNS, CI/CD READINESS, MONITORING, BACKUPS, AND REAL-WORLD PRODUCTION CONCERNS, USING MODERN BEST PRACTICES ALIGNED WITH THE NODE.JS ECOSYSTEM AS OF JANUARY 2026 - STEP BY STEP