Hello,
I am wordpress expert developer and checked all need which you shared as per your need i will able to modify plugin and take care of responsive issue and will manage all point so please ping me .
having experience in Wordpress/Woocommerce, Wordpress theme/plugin /template development, Wordpress API, WordPress e-commerce sites, Bootstrap, HTML5, CSS3, PHP/MySql, all the CMS/Framework of PHP, Integrations/Customization of theme/plugins/API development.
I can easily do any type of development work according to your requirements.