Contributed targeted bug fixes to Zephyr-based device management and testing infrastructure, focusing on reliability and compatibility. In the kholia/zephyr repository, addressed MCUmgr statistics reporting by implementing a configuration-driven solution in C and YAML that conditionally includes the return code field based on legacy behavior settings, improving management interface consistency. Later, in nrfconnect/sdk-zephyr, enhanced test automation by updating YAML configurations to replace native_posix with native_sim and reformatting platform lists for better Twister recognition, which stabilized cross-platform testing and improved CI feedback. The work demonstrated depth in embedded systems, platform management, and test automation, emphasizing maintainability and traceability.