Fiverr deals with gigantic amounts of rich user-generated content at any given moment. We run our own billing, messaging, search and order management systems. Our systems were designed for maximum data integrity, so most non ACID NoSQL solutions are out of the question. In addition, unlike blogs or news sites where data remains static after it has been posted, our data continues to change as users interact with their orders, sellers and gigs constantly. This makes our databases write-intensive and much harder to scale out.