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kotlinlang

Fellows, I am considering using Kotlin to create a mobile backend.  As background, I have never built a mobile backend before, and the backend I am building is for a prototype product.   As a result, iteration speed is crucial and performance doesn't matter too much at all right now.  I expect I will have to throw a few things away before performance starts to matter.  First of all, does anyone have any advice on what http library to use?  I want to serve json.  Second, any thoughts on using kotlin vs., say, django for my case?  My programming experience has been in building parts of very big, complex, fast, numerical systems in java as part of a team of smart people, so I am new to building a backend with much looser performance requirements but where iteration speed is crucial.