You should be an experienced PHP and and MySQL coder.
There should be a possibility for a user to register either as a vendor (sellers account), or a buyer (normal account). A vendor should be able to upload pictures and info to his items.
There should be an Escrow functionality. The site should get an adjustable percentage of the finished deals.
(Normal Escrow and Multisig-Escrow)
There should be an admin panel for maintenance, resolving disputes and support.
There should be a Bitcoin handling mechanism.
I should import my own BTC Adresses
The suggested achitecture is a LAMP-stack, but other sort of arrangement could be possible as long it runs under Linux.
There should be three types of access permissions
Administrator: Access to every part of the site.
Support: Access to read and reply to support tickets. Resolving disputes, only access to funds placed in escrow.
User: Access to own account only
There should be no captcha on the site. A user should instead be UNIX-like blocked from access after 5 failed login tries for 20 min.
All EXIF data should be removed from JPG's when uploaded to the site. 
The menu and sub-menu items
- Become a seller
- Withdraw to account
+ Possibility to filter
-Domestic -from- -to-
- Shopping cart
- Escrow mode
- New Orders
- Accept Orders
- Sent Orders
- Finished Orders
Private Messages (Encryption GPG)
- New message
- 2-FA GPG - Two-Factor GnuPG for Two-Factor?
- PIN For all user for withdraw money any user creat the pin FIRST TIME WHNE CREAT MEMEMEBR
- Report a problem
16 freelancers are bidding on average €788 for this job
Hi I checked your project requirements I can help you I have good experience in this project and I am confident to give you positive result with my skills and dedication according to your requirements. Thanks