Worked on the googleapis/google-cloud-php repository to enhance reliability and compatibility across PHP versions by addressing error handling in the Serializer class. Focused on backend development using PHP, the main contribution involved updating the error-catching mechanism to handle Throwable instead of just Exception, ensuring proper support for PHP 7 and newer environments. This change reduced serialization-time failures and improved runtime stability for end users, aligning the codebase with gax-php issue 664 for consistent error semantics. The work demonstrated attention to cross-version compatibility and careful integration with existing backend systems, leveraging strong PHP expertise to address a nuanced compatibility challenge.