Gurpreet Sarngal developed end-to-end NativeJS integration for the rdkcentral/entservices-apis and rdkcentral/entservices-infra repositories, enabling JavaScript runtime plugins to manage media playback within a C++ environment. He established new lifecycle interfaces for initializing, launching, and destroying NativeJS applications, and standardized API return types to Core::hresult for improved error handling and maintainability. Using C++ and CMake, Gurpreet implemented robust resource management and enhanced deinitialization processes to prevent leaks and ensure clean shutdowns. His work focused on interface stabilization, plugin development, and alignment with coding guidelines, laying the groundwork for future JavaScript-driven features and easier long-term maintenance.