market place for tutors that want to provide their skills over internet and skype from everywhere and at anytime

Functional requirements The application must provide all needed functionalities for an online learning marketplace to students (people that what to learn new skills), to teachers/institutes (people/organizations that provide skills) and to admin (marketplace operator that control and run the application/marketplace). The functionalities of such as marketplace can be looked from [login to view URL] [login to view URL] [login to view URL] non-functional requirements 1- the application must be scalable and get better performance when the hardware horizontally scales (e.g. adding a new computer in the cluster) 2- clean-code. The freelancer will provide us the complete source code for the application and this must be clean, good structured and good documented. Another programmer must be able to understand it easily. 3- the installation and running the application must be documented so that our admin can install and maintain it independently. 4- the application must be secure against attacks. It must be protected against SQL-injection, XSS, source code revelation, remote file inclusion, session hijacking, Cross Site Request Forgery, directory traversal and … 5- the application must not violence against any copyrights. We will consider freelancers that have already a ready solution. Please send us a link of a full functional demo version.