Hi there,
i have read your requirements, it looks like an interesting idea you have, i like it, and i am interested in working on it for you.
i am an expert Software developer with many years of experience, in Mobile and pp development, i use apache cordova tools for visual studio to build apps, and mainly i use IONIC for user interface, as it is mobile friendly and it is the trend currently, and choice for cordova development. just to explain, cordova is phongap, but the free version of it.
pleae consider my bid, i would like to discuss more if you are interested.