The readme for the interview is here.
This repository accompanies my YouTube video series on building a RESTful API with Node.js: https://www.youtube.com/playlist?list=PL55RiY5tL51q4D-B63KBnygU6opNPFk_q
Check out the branch you're interested in (i.e. which belongs to the video in my series you just watched), git clone it and thereafter run npm install.