Developed and delivered the Fabric Usage Preview API for the test-repo-billy/azure-rest-api-specs repository, focusing on enhancing resource governance for Azure clients. The work involved designing and implementing a new preview API version that enables users to list resource quotas alongside current usage and limits, supporting proactive cost management and capacity planning. Leveraging Typescript and expertise in API development and cloud computing, the developer introduced new data models, Quota and QuotaName, and extended the OpenAPI specification with a listUsages operation. This feature provided improved visibility into quota consumption, laying the foundation for more transparent and efficient resource management workflows.