Worked on improving exception handling across the symfony/console and symfony/http-kernel repositories by addressing issues with non-integer exception codes. Focused on backend development using PHP, the work introduced explicit fallbacks to zero when getCode() did not return an integer, ensuring consistent and robust error handling throughout the Symfony framework. Added comprehensive unit tests to validate these changes, which enhanced the reliability of error reporting and logging in edge cases. By increasing test coverage and standardizing error-code handling, the updates reduced the risk of runtime exceptions and contributed to more stable user-facing error management in Symfony’s core components.