The legal department at State Street Corp. employs a small army of lawyers, and with good reason. The Boston-based financial services holding company employs about 30,000 people and earns revenue in the billions. To keep its edge in an ever-changing industry, State Street leverages the latest technology to provide services to its clients.

Leading the charge is Jeffrey Carp, executive vice president and chief legal officer. Carp oversees about 600 employees, 190 of them lawyers. The attorneys handle everything from internal investigations to network security.