Mobile friendly wordpress inventory browser\gallery plugin for a small retailer

We are a furniture consignment store with an existing wordpress website with an older custom theme. Our most popular feature of our site is our inventory browser\gallery. While its working for desktop browsers, it does not work very well on mobile devices. This inventory browser is connected to our POS/Inventory system. We have an existing custom plugin that imports our inventory items into wordpress as a Custom post type "Items". The custom post type contains the item (feature)image, price, store, description, consignor ID, Item ID, and date added. Each item is unique, as such we will have a lot of unique images. Here is our current inventory browser, please review this prior to bidding. [login to view URL] We have a test site that closely matches our production site, that we will provide access to for testing and deployment of the new plugin. This project will be broken into 3 milestones, initial build, bug fixing, final build. 1. Initial build will require the plugin to be installed and all required features to be in working order 2. Bug fixing will be completed once all major bugs are resolved and all major features are working without issue 3. Final Build will be completed once the plugin is installed into our production site and all major functions are working and bug free Note: Our owner has the final approval in the overall appearance and functions What we are looking for: We are looking for a wordpress plugin developer to help us build a custom plugin to replace our current inventory browser with one that is mobile friendly, visually appealing, not relent on a particular theme. This custom plugin MUST replicate the auto adding and removal of the items we have today. Features we must have: -Mobile friendly (phones, tablets, IOS, Android) -Include features to import the image & data from our POS system, this will need to be configurable (ie data to import, username/password, url/ip of resource - replacing our custom plugin, current plugin code is available for analysis -Support for 2000+ images in appealing grid/masonry layout (open to suggestions on layout) -Search & filter items based on category, title, store, price -default Sort items by newest item to oldest -Auto rotate all images into Landscape (no sideways images uploads from tablets, current problem) -Social media sharing per item (ie share\send to a friend on facebook, twitter, pintrest, email, instagram, etc) -When hovering over the items, show the price, description, store (in a lightbox, open to suggestions) -clicking the item image, expand into single page post, larger image with with all [login to view URL] have attached an image of what we think we would like, we are open to suggestions -When viewing an item, show similar items (same category) below the item -Ability to "Feature" items - highlight the item, move to the top of the search/filter (open to suggestions on appearance and function) -ability to hide categories, stores from the inventory browser\gallery, search results, filters, etc. -Add an "image slider" that shows featured items or newest item added - should be configurable Features we would like to have: -pre-caching images to speed up loading -When an item is sold in the pos, put a SOLD watermark over the image for 24hrs (from sold time), then remove the item and delete the images from wordpress -Add a watermark at the bottom of all images that displays our company name -ability to move this plugin to another website and have it work, we would need a settings options to set password/user, import fields from pos/inventory system. -ability to change the fonts used within the plugin, ie change the price font, increase the size, color, etc -hover over image zoom -Over time unsold items reduce in price, when this occurs highlight the item and put a "new price" watermark on the image What we do not want: -a new/updated custom theme -online sales options, No woocommerce -item reservation system