Can you PM me link to demo exchange site, with some demo logins, to check the back-end
thanks
Do you search about the demo website backend work mate? Search for Hyperledger Composer on the Google search you will be able to find the template for various kind of project in that Trading and exchange option also there mate.
If you prewritten front end and the owner has the back end compiler means they can get it from your check it whether it works good or not.