Developed a flexible namespace autoloader for the opencart/opencart repository, focusing on backend development using PHP. The solution introduced multi-directory support for both PSR-4 and non-PSR-4 class loading, allowing the autoloader to search across multiple directories for a given namespace. This approach improved the resilience and flexibility of class loading, particularly in varied deployment environments, and simplified the process of developing extensions and plugins. The work demonstrated advanced understanding of PHP autoloading mechanisms and adherence to PSR-4 standards while accommodating legacy structures, resulting in enhanced compatibility and easier integration for module and plugin developers within the project.