Yijing Lu developed and expanded device registry capabilities in the mikeharder/azure-rest-api-specs and Azure/azure-rest-api-specs repositories, focusing on API development and cloud services using TypeScript and JSON. Over two months, Yijing introduced a Device Registry Namespace, enhanced provisioning features, and delivered asset management API specifications that support multiple authentication methods and asset lifecycle management. The work emphasized API consistency, maintainability, and alignment with customer onboarding workflows. By designing new models, updating authentication schemas, and stabilizing preview APIs, Yijing enabled more flexible and secure device management, demonstrating depth in cloud computing and disciplined OpenAPI specification design throughout the development process.