Karyawan Barang System is a three-tier class diagram modeling employee authentication, product inventory, and backup operations with static utility services. Karyawan class manages employee credentials via PasswordHasher static methods, Barang class generates product codes through KodeGenerator, and BackupService orchestrates data persistence using Koneksi for database transactions. This architecture demonstrates separation of concerns, secure password handling, and centralized connection management—critical patterns for multi-tenant inventory platforms. Fork and customize this diagram on Diagrams.so to adapt employee roles, product categories, or backup scheduling for your domain model.