We are Building Ecommerce Store on Magento.
Hosting would be on Amazon AWS, Developer Should be Comfortable with SSH.
We have a Theme in Mind.
Back End would be Marketplace with Vendor Based Login.
Some Tweaks would be needed on Core Magento on Time to Time Basis , hence this would be Long Term Position.
Our Initial Budget to get Store Up and Running is $100, Enhancements would be Paid as per Size of Work