Hi there,
I have reviewed your project details that you need to extend the functionality of a custom WordPress plugin. I am a certified WordPress developer. I am expert in plugin design, development,integration and customization as well. I have delivered more than 440+ projects successfully to the clients. I have a huge experience in PHP, CSS, HTML, Bootstrap, java script, Java query and Woocommerce etc.
I am sending to you few of my plugin project... please have a look...
https://www.freelancer.com/projects/PHP-Wordpress/customize-Wordpress-plugin.4903333/
https://www.freelancer.com/projects/PHP-Wordpress/modify-traffic-tools-plugin-advertising/
https://www.freelancer.com/projects/PHP-HTML.1/wordpress-plugin.6454097/
https://www.freelancer.com/projects/PHP-Software-Architecture/Wordpress-DEV-EXPERTS-ONLY-Create/
Regards,
Sana