Tom Welch developed a Plain Content Security Policy (CSP) preset for the spatie/laravel-csp repository, enabling Laravel web applications to define granular sources for scripts, styles, images, and connections. He approached the task with a focus on backend development and test-driven methodologies, updating the test suite to ensure the new preset integrated smoothly with the framework and functioned as intended. Using PHP and leveraging Laravel’s extensibility, Tom’s work enhanced security configurability and reduced the risk of CSP misconfigurations. The feature was delivered through Git-based collaboration, with continuous integration practices supporting reliable deployment and maintainability throughout the development process.