Grant Lanham refactored the Mullvad Leta search engine integration in the searxng/searxng repository, adapting it to recent API changes and introducing support for both Google and Brave as configurable search engines. He implemented a disable-by-default approach for these engines to prevent stale results, ensuring that activation occurs only when production-ready. Using Python, HTML, and YAML, Grant focused on backend development and API integration, enhancing the maintainability and configurability of the search engine framework. His work established a robust foundation for future enhancements, enabling more flexible search engine development and supporting rapid iteration while maintaining safe, auditable deployment practices.