Worked on security and data integrity enhancements within the laravel/framework repository, focusing on backend development using PHP and unit testing. Addressed two critical bugs by enforcing strict equality in the date_equals validation rule, which improved input reliability and prevented bypasses due to loose comparison logic. Strengthened the routing layer’s deserialization process to mitigate PHP Object Injection risks by restricting allowed classes during unserialization and implementing a whitelist for necessary classes. Integrated comprehensive tests to ensure invalid inputs and unauthorized objects are rejected, with all changes verified through continuous integration. These updates reduced the framework’s attack surface and improved overall security posture.