mobile application

I have an mobile app for learning. I am looking to simplify the application. The application is synced with an online back end which will need some alterations also. Specifically I am looking to add a functionality whereby a user can upload a powerpoint presentation, record their audio over the slides and then send out as a video file to the mobile device. It is not that difficult a task given the technology is already available and the existing CMS was built using open source tech. I am also looking for someone to port the whole solution to android and blackberry. Please note I have the source code for all iOS devices and this can be provided to assist in the porting process. More information will be given to successful applicant. In addition an NDA will be required to be signed. Please note this job is only open to people with experience in mobile application development and expertise using Joomla as a CMS,