Hello Lynna,
Yes, we can help you to build your crypto currency exchange site.
Kindly share your requirements in details so that I can get a clear idea of the total scope of the job.
We have very good experience in website designing and development using WordPress, PHP, CodeIgniter, CakePHP, Laravel, MySQL, Ajax, HTML5, CSS3, Bootstrap, jQuery, JavaScript etc...
Let's discuss more details...
Regards
Esha