I read this as one literally one function... i.e. Azure Functions/AWS Lambda but probably biased by my other reading!
I think to better answer I would ask:
Is this for experimentation - or are you intending to build experience in any particular language or framework (you mention Java 8 functional language features - could the two be combined)?
Is this a portfolio piece or intended to be used as a product?
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How did you get on... did you make a pick?
I read this as one literally one function... i.e. Azure Functions/AWS Lambda but probably biased by my other reading!
I think to better answer I would ask: