Worked on the keycloak/keycloak repository to deliver OAuth 2.0 compliance enhancements, focusing on security and alignment with evolving specifications. Implemented HTTPS enforcement and wildcard redirect URI handling to prepare the codebase for FAPI 2.0 adoption, addressing enterprise security requirements. Adjusted invalid_grant error responses to return HTTP 400, ensuring strict adherence to OAuth 2.0 standards and improving interoperability with compliant clients. Strengthened security checks within the secure-client-executor to reduce misconfigurations and harden OAuth flows. Utilized Java and JavaScript for backend development, applying expertise in API development and security compliance to close key issues and support enterprise readiness.