Worked on the zextras/carbonio-shell-ui repository to enhance email handling by enabling users to send emails on behalf of distribution lists and shared accounts. Developed new retrieval flows to expose available email addresses for user selection, improving flexibility in email composition. Refined rights checks for distribution lists to ensure proper permissions, and updated unit tests to validate the new behaviors. Leveraged TypeScript and full stack development skills to implement these features, focusing on stability and reliability. No blocking bugs were reported during this period, and all changes were thoroughly tested to support seamless collaboration and reduce friction in shared account usage.