I run a niche multi-vendor auction/marketplace site, but I'm intent on introducing Bitcoin as a means of payment between buyer and seller, however I doubt many buyers would take up that option without an escrow service.
(Examples of sites currently running this set-up would be bitmit.net, coingig.com etc.
Some relevant code may be available here
https://github.com/kangasbros/django-bitcoin )
This job would either entail integrating a Bitcoin escrow with an existing multi-vendor marketplace software (PHPProBid or WeBid) or creating one from scratch.
Specifications for Bitcoin Integration on a Marketplace.
1) Users and sellers will have a bitcoin address generated upon sign up or can add a pre-existing one.
2) The site automatically collects a commission on vendor listings when a transaction is completed (BUYER -> ESCROW(me) -> SELLER)
3) Customers can place a transaction into dispute-resolution if they don't receive their product, where I can decide who should recieve the payment.
4) I would like to set a 30-day auto finalize on the escrow payment if the customer doesn't log back in to finalize the order after receiving their product.
PM me if you'd like to bid for this project, or reply here if you'd like more details.
Cheers!