Design logo and Android/Blackberry/iOS

I am looking for a logo and Android/IOS/Blackberry app to be developed for a security company (I will give you more details in private). The app will contain a significant amount of information - like a book in many ways so will need to be very effective at showing data - flicking through, searching, etc. You should also have use relevant (free) images to make the data look better. The logo and apps will have to look very slick, clean and modern (I like how the new Feedly app looks for example). It must also be built so that in future it can be translated into other languages easily. The app must be downloadable and not be required to be online all the time for it to work. Also, you must be excellent at coding as will only be the beginning of a few stages - if it is successfull it could be the beginning of a lot more work - involving advanced functionality such as secure features etc. Also the app must also be designed so that I can take over it and easily modify/add/remove content myself. Ideally you will be in London but remote work is fine. I will not give anyone the job unless you are prepared to send me an example of the logo you are proposing (sorry, some people are just bad artists!