Information Systems Security Engineer (ISSE)

RDR • Chantilly, VA

1d

About The Position

Protect critical national security systems as an Information Systems Security Engineer (ISSE) supporting mission-critical government programs. The ISSE serves as a cybersecurity advisor to government stakeholders, engineers, and mission partners, helping architect, assess, and strengthen enterprise security solutions. The role influences security strategy, leads Risk Management Framework (RMF) efforts, and supports compliance across complex environments.

The ISSE designs, implements, and maintains security controls that support mission success. This includes advising government customers, managing security requirements throughout the system lifecycle, participating in architecture reviews and assessments, collaborating with technical and program teams, mitigating risk, and guiding system owners through Assessment and Authorization (A&A) and accreditation activities. The role also reviews cybersecurity documentation and provides subject-matter expertise on applicable policies, standards, and regulations.

Requirements

• Active TS/SCI security clearance with a current CI Polygraph.
• Bachelor's degree in a STEM discipline or an advanced Information Assurance certification.
• Current DoD 8570-compliant certification in IAT or IAM.
• Experience in security systems engineering across diverse computing environments, including standalone, LAN, and WAN architectures.
• Experience implementing and assessing security controls aligned with the Risk Management Framework (RMF) and NIST 800-53.
• Working knowledge of NIST guidance, DISA STIGs, and USCYBERCOM security requirements.
• Experience developing, maintaining, and reviewing cybersecurity accreditation documentation.
• Experience with system hardening, vulnerability management, operating system security configuration, and account management best practices.
• Strong understanding of network security principles and enterprise security architectures.

Nice To Haves

• Experience supporting Intelligence Community (IC) or Department of Defense (DoD) cybersecurity programs.
• Knowledge of Splunk.
• Familiarity with cloud security concepts and Amazon Web Services (AWS).
• Experience using cybersecurity assessment and vulnerability management tools such as ACAS, HBSS, EVSS, Retina, or similar technologies.
• Experience with XACTA and cybersecurity compliance workflows.
• Familiarity with Cross Domain Solutions (CDS).
• Experience briefing senior government leaders and stakeholders.
• Ability to manage multiple priorities in a fast-paced, mission-driven environment.
• Proven ability to work independently while collaborating effectively across technical and program teams.

Responsibilities

• Provide expert cybersecurity guidance and technical recommendations to government customers.
• Lead the identification, analysis, and documentation of security requirements throughout the system lifecycle.
• Participate in network architecture reviews, security assessments, and testing activities to validate compliance and strengthen security posture.
• Collaborate with system administrators, developers, engineers, and program stakeholders to integrate security requirements into system designs.
• Identify and mitigate risks by implementing RMF controls and industry best practices.
• Assess new hardware, software, and technologies and recommend improvements to security and operational effectiveness.
• Review and validate System Security Plans (SSPs), Security Requirements Traceability Matrices (SRTMs), and related cybersecurity documentation.
• Guide system owners through Assessment and Authorization (A&A) activities and support successful accreditation efforts.
• Serve as a subject-matter expert on cybersecurity policies, standards, and regulatory requirements.

Benefits

• Support high-visibility national security missions.
• Work alongside cybersecurity and engineering professionals.
• Influence security strategy for critical government systems.
• Tackle complex technical challenges in a dynamic environment.
• Expand expertise across RMF, cloud security, enterprise architecture, and advanced cyber defense initiatives.
• Contribute directly to mission success.

What This Job Offers

• Job Type: Full-time