Worked on the pinterest/ray repository to address a critical issue in the token validation flow, focusing on backend development using C++. The main contribution involved reverting a previous change that had incorrectly included the ray.io audience in TokenReview requests, which had led to improper audience handling during authentication. By removing the audience specification from the token validation process, the work restored correct authentication behavior and reduced the risk of security or authorization errors. This targeted bug fix stabilized the authentication flow and ensured compliance with expected TokenReview standards, demonstrating a methodical approach to maintaining backend reliability and security in C++.