Worked on the symfony/symfony repository to improve the stability of background processing by addressing a deprecation warning in the Beanstalk Messenger component. Focused on backend development using PHP, the work involved ensuring that the delay parameter passed to the Beanstalk client was always an integer, preventing warning messages and potential job misrouting. This was achieved by implementing type casting and adding comprehensive test coverage, specifically the testSendWithRoundedDelay, to verify correct rounding behavior. The approach emphasized careful type handling and test-driven validation, maintaining compatibility with the Beanstalk client and safeguarding against regressions through targeted testing and code review.