Information Systems Security Engineer (ISSE)

RDR, Inc.; Chantilly (VA); On-site; USD 120,000 - 180,000; Full time

Job summary

RDR, Inc. seeks an Information Systems Security Engineer (ISSE) to serve as a trusted cyber security advisor for government customers in Chantilly, VA.

You will architect, assess, and strengthen enterprise security solutions, leading RMF efforts and ensuring compliance across complex environments. You will partner with government stakeholders, engineers, and program teams to integrate security into system designs, review accreditation documents, and guide A&A processes.

Qualifications

• Active TS/SCI with CI Polygraph required.
• Bachelor's in STEM or an advanced IA certification.
• DoD 8570-compliant IAT or IAM certification.
• Experience in security systems engineering across LAN/WAN.
• Experience with RMF and NIST 800-53.
• Knowledge of NIST guidance, DISA STIGs, USCYBERCOM requirements.
• Experience developing and reviewing accreditation docs.
• Experience with system hardening and vulnerability management.
• Strong understanding of enterprise security architectures.

Responsibilities

• Provide expert cyber security guidance to government customers.
• Lead security requirements analysis across the system lifecycle.
• Participate in architecture reviews, assessments, and testing for compliance.
• Collaborate with admins, developers, and program stakeholders on security integration.
• Identify and mitigate risks via RMF controls and best practices.
• Assess new hardware/software for security and operational impact.
• Review SSPs, SRTMs, and related cybersecurity docs.
• Guide A&A activities for successful accreditation.
• Serve as SME on cybersecurity policies, standards, and regs.

Skills

TS/SCI with CI Polygraph

Bachelor's in STEM or IA cert

DoD 8570 IAT/IAM cert

Security systems engineering

RMF & NIST 800-53

NIST guidance familiarity

Accreditation documentation

Network security & enterprise arch

Ability to brief senior leaders

Education

Bachelor's degree in STEM or IA

Tools

ACAS

HBSS

EVSS

Retina

XACTA

CDS

Job description

Protect the Nation's Most Critical Systems. Drive Cyber Security Excellence.

Are you a cyber security professional looking to make a direct impact on national security? Join a high-performing team supporting mission-critical government programs where your expertise will help safeguard some of the nation's most sensitive networks, systems, and information assets.

As an Information Systems Security Engineer (ISSE), you will serve as a trusted cyber security advisor, working alongside government stakeholders, engineers, and mission partners to architect, assess, and strengthen enterprise security solutions. This is an opportunity to influence security strategy, lead RMF efforts, and help ensure compliance across complex, evolving environments.

If you're passionate about cyber defense, security engineering, risk management, and protecting mission-essential capabilities, we'd like to hear from you.

What You'll Do

As an ISSE, you will play a critical role in designing, implementing, and maintaining security controls that support mission success. Responsibilities include:

• Provide expert cyber security 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 closely with system administrators, developers, engineers, and program stakeholders to ensure security requirements are integrated into system designs.
• Identify and mitigate risks through the implementation of RMF controls and industry best practices.
• Assess new hardware, software, and technologies, providing actionable recommendations to improve 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 & Authorization (A&A) activities and support successful accreditation efforts.
• Serve as a subject matter expert on cybersecurity policies, standards, and regulatory requirements.

Requirements

To be considered, candidates must possess:

• Active TS/SCI security clearance with a current CI Polygraph
• Bachelor's degree in a STEM discipline (Science, Technology, Engineering, or Mathematics) 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

Preferred Qualifications

Candidates with the following experience will stand out:

• 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

Why Join Us?

• Support high-visibility national security missions
• Work alongside elite cyber security and engineering professionals
• Influence security strategy for critical government systems
• Tackle complex technical challenges in a dynamic environment
• Expand your expertise across RMF, cloud security, enterprise architecture, and advanced cyber defense initiatives
• Be part of a team where your contributions directly impact mission success