Muthushiamsankar N. developed and stabilized testing and DRM infrastructure across rdkcentral/entservices-infra, meta-middleware-generic-support, and meta-rdk-video. He implemented Rialto App Session Initialization to support NPLB test execution, enhancing automated test coverage and reliability. His work included updating build systems and configuration management to ensure compatibility between testing frameworks and middleware layers. In meta-rdk-video, he addressed DRM stability by refining Playready and Widevine integration, and upstreamed Widevine v18 support for Broadcom platforms. Using C++ and Python, he applied system programming and DevOps practices to deliver robust, maintainable solutions that improved both test automation and digital rights management workflows.