Contact Us Offices San Jose The Duquette Engineering Corporate offices are located in San Jose, the business center of Silicon Valley. This location provides free parking and exceptionally good access to the 280, 880 and 101 freeways, as well as the San Jose International Airport. Corporate Headquarters Location: 4340 Stevens Creek Blvd., Suite 200, San Jose, CA 95129 Phone: 408-615-9200 Email: info@duquette-eng.com For a firm that focuses on setting up systems that promote efficiency and effectiveness, we like to think our space layout does just that. With offices that provide the space and privacy to get the job done. And support staff areas designed to allow teams to work well together.