• Developed and implemented a comprehensive license management system using NestJS, featuring multipleservices tailored for different user types and roles.• Developed a modular application with extensible plugin architecture, enabling dynamic feature expansion andcustomization.• Implemented key features including application management, plugin management, subscription plans, pricing,and user management with role-based access control.• Developed and integrated a scalable call center application with advanced plugin subscription functionality,enhancing customer support capabilities and operational flexibility.• Developed and implemented a flexible configuration system for customizing application settings and behavior.• Worked with a Modular Monolith architecture, improving system modularity and scalability.• Utilized TypeORM for efficient database operations with MySQL/MariaDB, ensuring scalability and performance.• Integrated security features such as JWT-based authentication, role-based access control, and OTP functionality.