Worked on the element-hq/matrix-authentication-service repository to enhance OpenID Connect provider metadata validation, focusing on compliance and interoperability. Addressed a key bug by making the token_endpoint_auth_signing_alg_values_supported field optional, simplifying validation logic to better align with OIDC specifications. This adjustment reduced unnecessary checks and minimized potential error states during provider configuration, improving integration with diverse identity providers. Utilized Rust for backend development, applying expertise in API design, OAuth2, and OpenID Connect protocols. The work prioritized stability and maintainability, delivering a targeted fix that lowered maintenance overhead for authentication token handling without introducing new features during the development period.