Charlie Cheever is the co-founder of Quora, an online knowledge market. Cheever also founded expo.dev, a web app that works both with iOS and Android by writing in Javascript. Additionally, he works at castle.xyz, developing the mobile application Castle - Make and Play which allows users to play and create interactive scenes, which can range from simple art and drawings to tiny homemade games and music.

Quora is a social question-and-answer website and online knowledge market headquartered in Mountain View, California. It was founded on June 25, 2009, and made available to the public on June 21, 2010. Users can collaborate by editing questions and commenting on answers that have been submitted by other users. As of 2020, the website was visited by 300 million users a month.