Freelance Recruitment dashboard management - SmartJobBoard Custom Development/PHP/API

We are looking at developing a website with the following features using SmartJobBoard - [login to view URL] as a base and developing it for our needs as it has many of the features built in. Overview A freelance dashboard allows to post one job and have it posted out to all the different freelance sites (elance, freelancer, odesk,). All the workers' replies could be funnelled back in and managed from one central work area. This would be hosted as a web app. Requirements Elance,Freelancer.com,Odesk API used Affiliate program integrated to each provider so I collect commissions User creates own profile with us and can link a profile from each site to their profile on our site Post one job which is posted to each site manage all applicants from one dash board all from our site search freelancers on our site across all three sites can use PM on our site across all sites The whole recruitment process on our dashboard in short More Detail The dashboard Users create a user ID on our website they can then link their profiles to our account from each freelance website. If the user does not have an account with the website they should be able to create a profile on our website. from the dashboard user should be able to manage the following Private messages across all three websites Post a job on one form which then submits to all sites Manage the profiles View all applications on each job showing applicants from all three websites. Must show all the normal info such as cover letter,amount etc but also where the application has come from such as via [login to view URL] To be able to hire and start contract via our website and then manage the progress the job via there also. So time tracking from odesk,com is viewable etc Example back end features -Post Job -My Profile -My Jobs - Resume Alerts - Accounts - Application Tracking - Billing History - My Notifications - Saved Resumes - Screening Questionnaires -Private messages -Other features -Member Login To have a monthly billing system in place users will sign up for plans such as up to 2 active job postings at. Time then 5,10,20 unlimited etc Integrate the affiliate program so we can collect commissions manage all applicants from one dash board all from our site search freelancers on our site across all three sites What I need from you An estimate for the backend only - what I mean from this is everything minus the front end home page. We can get data from freelance sites API or through a data scraping script