In 1992, Caruso joined MFS Communications,[3] a provider of business grade telecommunication products, and served on its executive team until it was sold to WorldCom in 1996.
[4] At WorldCom, Caruso worked as senior vice president[5] for a short time, but left in 1997 to co-found Level 3 Communications, Inc,[6] a telecommunications and internet service provider.
[17] From 2006 to 2011, Caruso served as a director of New Global Telecom's board, a company that provided Broadsoft-based hosted VoIP services to the cable industry.
From 2009 to 2011, Caruso served as a board member of GTS Central Europe, a fiber based telecom provider in Poland, Czech Republic, Slovakia, and Hungary.
[22] In 2011, Caruso was named a finalist for the Ernst & Young National Entrepreneur of the Year Award in the category of Media, Entertainment and Communications and was selected as one of the Eleven Colorado Business People to Watch by The Denver Post.