We are hiring for a Senior Computer Network Defense (CND) Engineer with an active TS/SCI clearance - with the ability to obtain and maintain a Counterintelligence (CI) Polygraph in our Springfield, VA location. Our positions are required to be onsite. The Senior Computer Network Defense (CND) Engineer tests, implements, deploys, maintains, review, and administers the hardware, software, and documentation required to support the CND capabilities. This may include, but is not limited to, Splunk, Security Information and Event Management (SIEM) products, vulnerability scanning tools as deployed within hosted Information Systems.