Worked on expanding Azure Key Vault certificate features across multiple repositories, focusing on cross-language support and maintainability. Enhanced SubjectAlternativeNames handling in the Azure/azure-rest-api-specs repository by adding URI and IP address support for Java, Python, and JavaScript SDKs, while updating API versions and refining configuration files. Improved the Java emitter API to support PFX-to-PEM conversion and streamlined API configuration by removing redundant overrides in Python and JavaScript. In the azure-sdk/azure-sdk-for-go repository, extended test coverage and implemented robust mock server testing for new certificate features. Leveraged skills in API development, Java, and Python to deliver maintainable, reliable solutions.