Veli Cepni contributed to the onOffice-Web-Org/oo-wp-plugin by enhancing property search filters and addressing a critical bug affecting estate detail page titles. Using PHP and focusing on backend development and API integration, Veli improved the filter logic to better handle boolean values and persist user selections, such as balcony results and rent-versus-purchase price filters. The work included consolidating filter functionality within the plugin, removing legacy code, and strengthening data integrity by refining the title sanitizer to handle null values safely. These changes improved search accuracy, maintainability, and observability, supporting both user experience and future plugin enhancements.