Worked on authentication and UI improvements for the menloresearch/JanCode repository, implementing profile-based AWS Bedrock authentication to allow users to configure access via AWS profiles and existing SSO or credential management. Enhanced the user interface by adding a toggle between direct credentials and profile-based authentication, increasing flexibility and security. Improved test reliability by simplifying Bedrock test scaffolding and removing unused mocks, supporting maintainable CI workflows. In the catppuccin/userstyles repository, delivered a targeted CSS fix to remove unintended shadows from the Gemini chat input container, aligning the UI with design guidelines. Utilized JavaScript, TypeScript, and CSS across both backend and frontend development.