When the founders of Rivian Electric Automobiles wanted to launch a new automobile brand, they turned to Rejouice, a venture agency based in Paris and San Diego. We've got all the questions. We wanted to know what was the experience like building a new brand in the automotive industry, what it's like working with, essentially a software company that makes trucks, and what exactly is a venture agency, anyway?  Rejouice founder Guillaume Hamon supplied us with the answers in this look at the life of an upstart California agency that focuses on working with upstart clients.