I suppose there are not so many people who do not know what Node.js is. You may love it, you may hate it, but you cannot deny the fact that more and more enterprises are using it to replace some parts of their system, previously written in Java, Rails or .Net.  Node.js runs in a lot of environments – starting from large, multi-core servers, through laptops, then microcomputers like Rasperry Pi, finishing on IoT devices...