YouTube, the most popular video sharing platform, has over 1.5 billion monthly users. Every minute, 500 hours of video is upload. How to help new channels grow subscribers? How can new content be discovered?

Zipcar, the most popular car rental app, has benefited many users who don't own a car but need a car. Using a zipcar is fairly easy. However, the back-end development and maintenance of the service is not as easy as it seems.