During February 2025, J. Ha focused on backend and full stack development for the SalesforceCommerceCloud/pwa-kit repository, addressing a security issue in the authentication flow. They refactored the applySLASPrivateClientToEndpoints regular expression in JavaScript to ensure the private client was applied only to designated social login endpoints. This targeted fix improved both the security and reliability of the login process by preventing unintended exposure of private client behavior. J. Ha validated the changes through a dedicated commit, demonstrating careful attention to detail and a methodical approach to problem-solving. Their work reflects depth in regex and backend authentication logic.