Worked on the badges/shields repository to deliver two targeted backend improvements using JavaScript and API integration skills. Developed a Matrix Summary Endpoint that introduced a fetchMode parameter, enabling flexible data retrieval through guest authentication or summary endpoints, and updated the Matrix service, query parameter schema, and tests to support this functionality. Enhanced the Mastodon Follow Service by refining domain handling, ensuring the domain parameter is treated strictly as a domain name, not a URL, with corresponding updates to documentation and test coverage. Focused on backend development, documentation, and testing to improve reliability, integration consistency, and developer onboarding for social endpoints.