Senior Information System Security Engineer
MantechWashington, District of Columbia, United States • Virginia, United States • Virginia, United States
Posted March 27, 2026
114600 - 190200 USD
Full Time
About the Company
Mantech is a technology and services firm that partners with U.S. federal agencies, the military, and allied organizations to deliver secure, mission‑critical solutions. Leveraging more than 57 years of experience, the company specializes in cyber defense, intelligence and counter‑intelligence, systems engineering, enterprise IT, software development, data analytics, and C4ISR/C5ISR capabilities. With a workforce of nearly 9,800 employees—40 % veterans and many from intelligence and homeland‑security backgrounds—Mantech brings firsthand operational insight to every project. Its reputation for reliability, adaptability, and a deep commitment to public service makes it a trusted partner for complex, high‑stakes challenges across defense, healthcare, and environmental sectors.
Job Description
MANTECH is seeking a Senior Information System Security Engineer to join their team in Washington, D.C. or Virginia. The successful candidate will be responsible for designing and implementing cybersecurity solutions, managing vulnerabilities, and leading stakeholder engagement.
Requirements
- Define and implement cybersecurity requirements, architectures, and secure system designs
- Design, develop, and integrate security solutions, including Cross Domain Solutions (CDS)
- Implement network security controls and countermeasures
- Identify, assess, and mitigate system and network vulnerabilities
- Maintain and track vulnerability data, POA&Ms, and remediation activities
- Lead stakeholder engagement and provide rapid response to data calls and RFIs
- Hold at least one of the following certifications: CISSP, CASP CE, CSSLP, CISSP- ISSEP, CISM, or CISSP- ISSAP
- Familiarity with the use and operation of security tools including Tenable Nessus and/or Security Center
- Working knowledge of the National Institute of Standards and Technology (NIST) Risk Management Framework (RMF) and ATO processes
- Experience with vulnerability management programs and federal cybersecurity directives
Benefits
- Health Insurance
- Life Insurance
- Paid Time Off
- Holiday Pay
- short-term and long-term Disability
- Retirement and Savings
- Learning and Development opportunities
- Wellness programs