I would like to see the SLING marketplace grow so that great vendors get higher margins and buyers pay less for products.  Right now, online centralized marketplaces like Amazon and eBay/PayPal take 13-18% off the top and leave the vendors struggling to make small margins.

I am a C++ programmer and would like to donate my time to further develop SLING if it okay with the community and DG.  I have 20+ years professional programming experience and began writing apps in C/C++. At work, I use C#, HTML5, JavaScript, CSS, SQL and NoSQL (MongoDB).  I work full time so this would be part time.

The most needed functionality is a marketplace rating/reputation system for sellers and buyers implemented on a public blockchain.  Next, the marketplace categories should be maintained by a consensus vote and the protocol should not allow end users to add categories (it is currently a mess and this drives users away).  The third task would be to implement an HTML5/JavaScript UI like Shadowcoin and Twister.  An HTML5 front-end would give the marketplace a better look/feel and allow others to enhance the front-end without writing C++ code.

I will need the community's help coming up with the specifications for a public blockchain marketplace rating/reputation system.