Worked on the microsoftgraph/msgraph-beta-sdk-dotnet repository to enhance error handling for Graph API clients by updating the GraphErrorCode enumeration. The contribution focused on adding missing error codes, which improved the clarity of error reporting and enabled faster diagnosis for users integrating with the API. This backend development effort, implemented in C#, aligned the SDK’s error codes with client expectations, reducing integration friction and supporting more robust client applications. The work demonstrated attention to code quality and collaborative development practices, as changes were peer-reviewed and merged. Skills applied included API development, backend engineering, and proficiency in C# for SDK maintenance.