Bespoke Web application

We are after building a web site that will perform the following tasks Login authentication against Facebook, LinkedIn, Twitter and Google as well as login with in built account aka Forms authentication Industry standard security with support for user login attempts, password expiry, auditing of logins, password storage, password strength, SSL etc... User profiles to set location, demographics, contact details, preferences from a configurable list of items that you would like to receive notifications about. The notifications are sent and tracked to people who are signed up to receive them As user of the system will be of different types, and therefore may need additional features such as the ability to list an item The user of the site will either be a Consumer or a Seller, where a Seller is able to list items for sale and a Consumer is able to see items in line with their preferences, as categorized below. Site structure Using a hierarchical schema to house category and sub-category items, potentially spanning several levels (1 to n) e.g Cars/Audi/A4 that are listed in the preferences for a user to select in their profile Within the schema we want to list items that are categorized as above and include item description, images, cost, location, expiry information Design You will need to ensure Bootstrap compliance and compliance to accessibility standards The design should consider the need to support multiple languages and time zones in the future All this needs to be built with a secured API to allow access from a mobile App in the future - ie rest endpoints etc...