TRIAD Group, Inc. | 20,121 followers on LinkedIn. Founded in 1986, the TRIAD Group is a Bellevue, Washington-based telecommunication services firm that adheres to the principles of service, integrity, and confidentiality. TRIAD Group began as a vendor to our first carrier in 2001 and has worked directly for all the major carriers since. TRIAD Group focuses on-site development services, including site acquisition, project management, utility coordination, and architectural and engineering services.