Senior ISSE — Cybersecurity Leader for Critical NC3 Systems

Leidos; Frederick (MD); On-site; USD 131,000 - 237,000; Full time

Benefits offered by this job

Health and Wellness programs

Competitive compensation

Income Protection

Paid Leave and Retirement

Job summary

Leidos is seeking a Senior Information Security Systems Engineer (ISSE) to join a focused team delivering IA architecture analysis and security engineering for NC3, COG, and Senior Leader communications. The role is hands-on and consultative, helping shape defense-grade cybersecurity.

You will perform risk assessments, architecture reviews, and guidance, working with DoD stakeholders to ensure RMF compliance, real-time threat response, and system security requirements across multiple enclaves.

Qualifications

• BS in CS/IA/InfoSec with 14+ years of ISSE or Systems Engineering exp.
• CISSP or CASP certification required
• Strong writing and briefing skills for senior DoD officials
• Expert RMF and cybersecurity risk assessment experience
• Experience with network security engineering and protective policies

Responsibilities

• Lead threat-informed cybersecurity products and risk assessments.
• Support design, implementation and operation of real-time threat capabilities.
• Evaluate candidate architectures against security requirements to identify gaps.
• Research emerging technologies to improve cybersecurity effectiveness.
• Aid stakeholders in developing innovative security solutions.
• Engage stakeholders to define security objectives and validation methods.
• Validate system security requirements and design across multiple enclaves
• Assist in information security functionality for enterprise solutions
• Contribute to certification, risk analysis, and awareness activities
• Review C&A documentation for completeness and compliance

Skills

Threat-informed cybersecurity

Cybersecurity risk assessments

Architecture reviews

RMF expertise

Zero Trust

Cloud Computing

Briefing to DoD officials

Independent work

Strong writing skills

Research and evaluation

Education

Bachelor of Science in Computer Science / Information Assurance / Information Security System Engineering

Tools

RMF

NIST SP 800 Series

CNSSI 1253

DoD 8500

Job description

Leidos is seeking a Senior Information Security Systems Engineer (ISSE) to join a focused team delivering IA architecture analysis and security engineering for NC3, COG, and Senior Leader communications. The role is hands-on and consultative, helping shape defense-grade cybersecurity.

You will perform risk assessments, architecture reviews, and guidance, working with DoD stakeholders to ensure RMF compliance, real-time threat response, and system security requirements across multiple enclaves.