The Chantilly, Va.-based contractor said Tuesday that his title will be group vice president and he will report to Senior Vice President for Operations Jeffrey Beyer.
The group also holds accounts with the Department of Housing and Urban Development and U.S. Treasury Bureaus.
Beyer credited Nigro with building Citizant’s IRS solutions delivery team that helped the company gain positions on several agency contract vehicles.
The company also credited Nigro with helping it win positions on small business contract vehicles within the Treasury Department.
The more than 20-year Army veteran joined the company as an operations manager in 2009.
Nigro served as a division chief for system application support services and a program manager for information systems in the military.
Once at Citizant, he initially oversaw contracts to provide the Labor Department with acquisition support for an enterprise-wide information technology system.
He also led contracts with the Agriculture Department to provide enterprise architecture support for a geospatial segment.
The company said in September that it had increased its workforce 35 percent dating since January 2011 and added 2, 000 square feet to its headquarters.