Nearly 3 years ago I discovered a new database that literally changed my life. I know, that’s a pretty bold claim, but it’s true. While leading the engineering team at OpenSky I faced a problem I was well familiar with. How to build a e-commerce product that: 1. Provided performance and scale 2. Handled many verticals and 3. Provided proper indexing on key attributes. In search for a better solution to this problem I encountered MongoDB.