Igor Plantas focused on backend development for the symfony/symfony repository, addressing a deprecation warning in the Beanstalk Messenger component. He resolved an issue where delay values passed to the Beanstalk client were not consistently integers, which could lead to warning messages and potential job misrouting. Using PHP, Igor implemented a fix that ensures the delay is always rounded and cast to an integer before submission. He reinforced this change with comprehensive testing, adding a dedicated test to verify correct rounding behavior and prevent regressions. His work demonstrated careful type handling and a test-driven approach to maintaining code stability.