San Diego-based DexCom, a developer of continuous glucose monitoring systems, said today that it has named Steven R. Pacelli as its Chief Operating Officer, and Jorge Valdes as Chief Technology Officer. Pacelli has been Chief Administrative Officer of the firm since December of 2008, and has been at the firm since April 2006. He has also served at Stradling Yocca Carlson & Rauth, Axcelerant, and Flashcom. Valdes was most recently the firm's Senior Vice President of Operations, and joined the firm in November of 2005. He has also served at Advanced Fibre Communications and Racal-Datacom.