Josh Lee developed a Python3-compatible VNET VXLAN testing framework for the sonic-net/sonic-mgmt repository, focusing on enhancing test reliability and hardware compatibility. He addressed route counting logic and restored ASIC DB checks to ensure test results accurately reflected hardware state, particularly for Cisco 8000 devices. His work automated test environment orchestration, including script error handling and service management, which reduced validation cycle time and improved test coverage. By validating changes on both simulation and physical hardware, Josh enabled safer VXLAN feature rollouts. His contributions demonstrated depth in Python, networking, and automated testing, resulting in a more robust and maintainable framework.