Build a Website Like Freelancer / Odesk for Investigators

I need a website like Freelancer / Odesk but for Investigative services, where clients can post projects (location based) and ex: private investigators, forensic accountants, researchers and others offering investigative services can bid on those projects. Investigators and clients will have profiles, and people can pick any investigator anywhere for hourly or fixed price, where the project can managed, including uploading and viewing of reports and various media fie types. Service be tracked using smart phone app first for android. We need all functions that Freelancer or Odesk provide for project awarding/communicating/sharing/tracking. The android app Will need to be able to gps track investigators, track their time, send and receive messages, upload media and store case by case information and contacts. We need a complete end-to-end solution SEO optimized, and for managing for various user types, projects, payments and API, email & email templates, as well as ad management. There should also be automatic posting of jobs on website social media accounts as well as RSS feed generation (generic and location specific). We should be able to control most site features, including content pages, footer links, ads, analytic, users, and other site features described above from the back-end. The design should reply on advertising and appropriate placement for maximum impressions and revenue.