Snapastaff is a Kentico 9 solution, with a custom purchasing engine that features Authorize.Net integration via API. The client wanted a simplistic site, reminiscent of Craigslist but with a little more flair and a lot more usability. With some light client scripts to allow for popover videos and other experience comforts, this site boasts many of our common web disciplines.
The simplicity you see on the public facing site was not accidental, nor was it easy to accomplish. It was a deliberate effort that took a number of design iterations to perfect, and the effective way that it conceals the complex inner workings is a testament to the success of the project.