Plugin developers/maintenance for wordpress

I am looking for an experienced plugin developer/maintenance freelancer to customize an existing plugin for my WordPress website. I know exactly which plugin I need customizing and am looking to improve the user interface for that particular plugin. I need the freelancer to be familiar with how WordPress works, have an expert understanding of plugin development and maintenance, and be knowledgeable in the desired functionality I am looking to add to the plugin. The successful freelancer must provide quality work and come highly recommended. thesmithlakelife.com is my site. Plugins are listingpro, IDXBroker, Groundhogg.io