Hi,
I would like to work on your project.
Can you let me know what kind of hosting you had in mind for your backend? For example, Amazon Web Services or Azure or maybe something else? The backend can be accessed through a web service or web api which the phones will send their requests through and then update the backend. Also, pull request will come from he phone to send data down.
I have created a clone of tinder before too, so I have an understanding of your app, but the backend doesn't know anything about the front-end so it doesn't necessarily have to be a tinder app.
Please feel free to contact me to discuss this further.
Kind Regards,
Canon