Custom Made Content Management System for new website

We are building a travel site and have specific requirements for front and back end development. This will be a custom made content management system. IT IS EXTREMELY IMPORTANT THAT YOU READ ALL OF THE BELOW POINTS BEFORE BIDDING. It will be very beneficial if you can show proof of your previous work that will illustrate your capabilities. - Google maps expert with a strong knowledge of the API functionality - PHP and MySQL expert - Excellent knowledge of how to integrate multiple XML feeds (prefer experience with Yahoo YQL) - Drop down filtering to narrow search results through the google map function and database. - Username and membership capabilities - Simple user creation with the ability to add services to create a unique itinerary or a wishlist. - Tagging capability to be used comprehensively throughout the site for services and interests. - Multiple database - Services to have a back end login and be able to update service info - Services forms for signup with drop down menus and automatically feeds data into relevant database. - Knowledge of opensource id logins - Social media posting - Drag and drop for itinerary items - Knowledge of web standards and CSS a bonus