Hi,
I'm pretty interested in your challenging project and would like to take part in development of your site. I have already experience in similar projects and I'm eager to start to work for you.
Mainly I'm programming in PHP (yii2 framework), JS, CSS, HTML etc
One of my colleagues is a good designer and if it is needed, he can design an excellent site layout for this project.
In order to better estimate the cost and time, please provide us with more details concerning your future site. I will be also great if you send us some links on the similar sites
Waiting for your reply,
Volodymyr