Information Systems Security Engineer - TS/SCI with Polygraph

Job DescriptionJob Description

TITLE: Information Systems Security Engineer (ISSE)

LOCATION: Tysons, VA

CLEARANCE REQUIRED: Active DoD TS/SCI Clearance

EMPLOYMENT TYPE: Full-time, On-site

TRAVEL: Up to 30%

POSITION SUMMARY

Modern Government Solutions (MGS) is seeking an Expert ISSE to provide expertise on security requirements for the design, implementation, and deployment of high-performance compute, storage, and network infrastructures. The role serves as the primary advisor to the program Chief Engineer and a liaison to Accrediting Officials, focusing on security-related design and accreditation policies. Responsibilities may also include COMSEC support and on-site systems integration.

RESPONSIBILITIES (not limited to):

The Expert ISSE implements and maintains information security controls associated with development, delivery, and continuous monitoring of complex, high performance, mission critical information technology systems.

• Develop, implement, and review security requirements, plans, and documentation to ensure system compliance with RMF, ICD 503, and NISPOM standards, including system security plans, traceability matrices, and disaster recovery.
• Perform security assessments, risk analysis, and continuous monitoring across networks, systems, and cloud environments, coordinating with stakeholders to optimize compliance and mitigate vulnerabilities.
• Provide guidance on system accreditation, authority to operate/connect processes, and secure deployments, leveraging tools such as NESSUS, HBSS, and NetWitness.
• Support the A&A lifecycle, including system hardening, software assessments, test planning, and Information Security Assessment Program reviews.
• Collaborate with development teams, engineers, and security offices to ensure adherence to security standards across diverse network platforms.

REQUIRED SKILLS AND QUALIFICATIONS

• Must possess an active Department of Defense (DoD) TS/SCI with Counterintelligence Polygraph security clearance.
• Bachelor's Degree in Computer Science, Networking, Systems Engineering or security- related fields.
  • Work experience in relevant fields may be considered for equivalency.
• 10+ years of experience in system security certification and accreditation.
• Recent and relevant experience in accrediting systems in NRO programs.
• Experience with RMF and the ATO process, including knowledge of security controls, risk assessment, and system accreditation.
• Familiarity with, and access to, Iron Mountain Data Center facilities.
• Strong interpersonal, organizational, and time management skills, with the ability to work both independently and collaboratively in team settings.
• Proven expertise in developing, documenting, and communicating complex plans, identifying and mitigating risks, and ensuring effective execution.

SKILLS AND QUALIFICATIONS

• CISSP (DOD 8570).
• Excellent communication and interpersonal skills.
• Familiarity with security accreditation-related documentation.
• Troubleshooting, root cause assessment and POA&M development.
• ITIL Foundations.
• Familiarity with tools including Nessus and Splunk.

*Applicants selected will be United States subject to a government security investigation and must meet eligibility requirements for access to classified information. *

ABOUT US

At MGS, we believe a people-first culture corresponds to organizational success through a commitment to excellence, integrity, , and an attitude that welcomes challenges meets demands, sustains growth, and drives innovation. We provide expert mission-first technical and programmatic services and solutions for the US intelligence community, the US Department of Defense, and other governmental agencies. We create people-first organizational cultures where employees feel needed in the system, not a system that needs employees. We provide you with long-term career opportunities centrally focused on our core value system: , integrity, and a commitment to excellence.

MGS is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to , , , , , , , or protected veteran status, and will not be discriminated against on the basis of .