Finish a Wordpress Plugin + Wordpress Website Development "Only Single Developer" No Teams, EU preferred

Please bid only if you are a single developer. No Teams please. We want a direct contact to the developer, no team manager etc...We search for a long term business relationship with a single developer.

We seek for a single developer who has deep understandings in Wordpress Core Coding and already developed Plugins for Wordpress. Else it would take too much time.

Developer Requirements:
- Wordpress core / Wordpress Plugin Coding
- Ultimate Member Plugin experience
- PHP
- MySQL Database
- Payment integration (Stripe, Paypro Global, Bitcoin...)
- PHP/API SOAP/REST coding
- HTML, CSS
- Bootstrap
- jQuery

What is needed?
- Finish the Webdesign
- Finish our Wordpress Plugin (secure connection between our website<->sellers website), 50% of coding is already done.
- Members Area for buyer and seller to handle purchases and Admin Area (Ultimate Member Plugin)
- Evaluation of URLs via API (Maj. Moz, G. Indexed,OBL,est. traffic, title)->Pricing Algorithm
- Order Processing with Payment processing

(website description)
The website is a marketplace where buyer and seller of backlinks meet each other. Seller can download a Wordpress plugin to load all his blog posts URLs to our website database. The buyer can choose from this list and purchase a link from these blog posts.. Our platforms handles the payment process and the Plugin automatically adds the link to the sellers blog post after payment. Payment is monthly. When payment subscriptions ends or failed, the plugin removes the link. Sellers getting paid monthly.

More project details ( PDF) can be sent via on chat.

We looking forward to your proposals.