Christian contributed to the spatie/laravel-csp repository by developing three new Content Security Policy (CSP) presets for Intercom, Google TLDs, and Posthog, each implemented as dedicated PHP classes with supporting documentation. He focused on backend development and security, enhancing the package’s flexibility and compliance for common integrations. Christian improved test coverage using PHPUnit, introducing snapshot tests to validate CSP directives and ensure reliability. He also refactored domain configuration logic, simplifying how Google domains are handled to reduce misconfigurations. His work demonstrated depth in PHP development and CSP management, delivering features that improved both developer experience and security posture.