Product display by filtering in Joomla site -- 3

I need someone who can help me finish a project I started some months ago here. Most of the job is done but unfortunately some vital functionality is not finished. Now I need to restart the project and hope that someone can do this job. It is a filtering function like this site, exactly like this one but with different products. [login to view URL] The ready solution shall be a component or a plugin that makes it possible to add new products easily in the backend of the joomla site. It also has to be working with HikaShop, ie. after the products has been filtered out a "Add to cart" button shall be displayed for adding to the HikaShop cart. Looking forwad to a serious freelenacer. Contact me so we can discuss what has to be done in order to make the project fulfilled.