Enterprise grade: mobile tracking system and business logic engine - repost

We require a gun programmer to develop a coded solution for our business requirements. * Write a protocol specification (soap or XML) to communicate from a mobile application to backend web service * Write the web Service (1) that will take data from a mobile device (using the above protocol) * Write and authenticate service (2) that will secure the user and device * Parse the received data from the web service (1) and write this to a Microsoft SQL Database * Write a business logic service that will process the parse data and return relevant information back to the web service (1) * Use the parsed data to create a vector / Rasta map data * Communicate the data and map information back to a mobile device. We are looking for an engineer who has ideally worked on enterprise grade systems and can produce a secure and scalable software stack for our business requirements. Preferred software stack will be: Windows Server 2008 Microsoft SQL Server Microsoft IIS Windows Services