John Stevenson developed and integrated a TerminalInputHelper class to centralize terminal state management and signal handling for interactive CLI input in the symfony/console and symfony/symfony repositories. By refactoring terminal setting management in core components like QuestionHelper and Application, he ensured consistent restoration of terminal state after signals such as SIGINT and SIGTERM. This work, implemented in PHP and leveraging skills in system programming and terminal emulation, addressed issues of terminal corruption following interrupts. The changes improved the reliability and user experience of interactive command-line tools, reducing the need for manual recovery and support for both developers and operators.