Worked on the keycloak/keycloak repository to enhance authentication flow resilience and maintain code quality. Addressed a bug in the OAuth2 refresh token process by ensuring expiration data is preserved when new responses omit this information, preventing session instability and data loss during token refresh cycles. Improved maintainability by removing unused Jackson imports from Java code, reducing clutter and simplifying future changes. Focused on backend development and identity management, with targeted code cleanup that supports easier audits and onboarding. The work contributed to more predictable session behavior and streamlined maintenance, leveraging Java and OAuth2 expertise to align with business reliability goals.