Update existing iPad app, camera access and graphics and web service

Hi all, I am looking for a company to partner with to look after the ongoing development of an existing iPad app. This is being done as my role within the company is changing. The app let's our field technicians enter details about the of the job they have been working on and sends this information back to the office. I am looking to partner with someone that has extensive experience with core data, and AFNetworking, restkit would be good to. Will need to do basic graphic design and update the interface. The first part of the update will come in two parts. 1 to allow the technicians to add photos to there jobs and send them to the web service. 2 to update the interface to suit iOS 7. I will post screenshots of the app in the coming days. If you can do C# development as well you will have a better chance of being selected as the office side to the app is written with it and will need to modified as well.