Seah Ying Hang enhanced authentication reliability in the skypilot-org/skypilot repository by refining backend authentication flows and strengthening test coverage. Focusing on Python-based API and backend development, Seah implemented consistency in BearerTokenMiddleware, introducing early-exit logic to align with other authentication middlewares and prevent redundant processing when a user is already authenticated. Seah also addressed an edge case where BasicAuth incorrectly rejected Bearer tokens when both BasicAuth and service accounts were enabled. Comprehensive testing improvements included updating thirteen tests to verify bypass behavior and ensure stable initialization, resulting in more robust authentication paths and improved reliability across the codebase.