Ask HN: Two Sided Marketplace Buildout

As a non-technical person, what is the most affordable way of setting up/programming a two sided marketplace (think Zaarly, Fiverr). I have come across a couple of clone scripts and they are lack the complexity, design and feature set that I need. Paying someone to program this from the ground up the best strategy or are their any code bases/ templates I should know about before I begin hiring a freelancer to finish this for me. Thanks for reading.