Code Expired Domain Selling Website from Scratch

Front-end website will be selling domains that have been imported from my admin/backend panel. I can load domains, and it will quickly check the domains and see if they are available (must be able to handle hundreds of thousands of domains). After, it will check the available domains for DA/PA/PR/TF/CF using the Moz/Majestic API/PR api. Will explain in more detail. When contacting me, include your background in this field and anything else that you may think is helpful.