Worked on the outline/outline repository to enhance authentication reliability by improving the OIDC authentication flow. Addressed the challenge of sparse userinfo responses from certain providers by implementing a fallback mechanism that extracts essential user attributes, such as email and username, directly from the id_token when necessary. Strengthened backend robustness by adding comprehensive error handling for JWT decoding, ensuring authentication processes remain stable even with inconsistent provider data. Utilized JavaScript and TypeScript to deliver these updates, focusing on authentication and backend development. The work improved cross-provider compatibility and ensured that user data extraction remains dependable across a variety of OIDC implementations.