For example deployd is open source AFAIR; others (like Firebase, Parse) are hosted solutions. But overall they all give you instant CRUD over your data. In your case, their turn-key multi-user capabilities are a bonus.
I've looked at kinvey before. Maybe worth looking back into this. Have you had any experience with their ability to scale? (I know - get users first and then scale :| but you know.. can't help but thinking it)
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...or you might want to forgo the custom back-end completely and use one of the "nobackend" solutions: http://nobackend.org/solutions.html
For example deployd is open source AFAIR; others (like Firebase, Parse) are hosted solutions. But overall they all give you instant CRUD over your data. In your case, their turn-key multi-user capabilities are a bonus.
I've looked at kinvey before. Maybe worth looking back into this. Have you had any experience with their ability to scale? (I know - get users first and then scale :| but you know.. can't help but thinking it)
Not really, I've only tried small things. But I _guess_ if you look around their documentation they should discuss SLAs and their KPIs.