Hello! I reviewed your job descrition and attached document. This app is not very complex in developing and my team can make approximately in 2 weeks. I saw, that design is already done, so, I hope you'll provide .psd or sketch files. I didn't sow Mail and Info screens in your file and I can't understand, what does checkbox right to the contact do, but I believe, you'll clarify it.
Let me introduce my team. It consists of 3 iOS developers and 2 Android developers and designer. We're situated in Minsk, Belarus and it's only one hour ahead Austria timezone, so communications will be comfortable. Also, I can involve german-speaking person in our conversations, if needed.
Our portfolio is below:
Android:
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iOs:
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Design:
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You can see, that we've done such projects, also we're now making app with mentioned features, like offline data storing and users profiles for iOS.
If you're interested in my proposal, please, contact me here or in skype i3859555.
Sincerly, Alex.