During their tenure, Divi Sharma developed wildcard leaf subdomain support for CORS allowed origins in the hasura/graphql-engine repository. They introduced the match_cors_origin function, which enables precise matching of both exact and leaf subdomain patterns, addressing the need for flexible multi-tenant deployments. Their approach included writing comprehensive unit tests to validate the new logic, ensuring correctness and reducing the risk of misconfiguration in cross-origin resource sharing. Working primarily in Rust and leveraging their expertise in API security and backend development, Divi delivered a focused, well-tested feature that enhances CORS configuration options without introducing unnecessary complexity or maintenance overhead.