Junior Information Systems Security Officer (ISSO)

We are seeking a driven Cybersecurity Professional to support Information Assurance (IA) initiatives and maintain system security integrity. You will actively assist with security operations, conduct risk assessments, and contribute to continuous compliance using the DoD Risk Management Framework (RMF) to safeguard classified information systems., Security Operations & Risk Management

• Oversee daily security configurations for classified processing environments.
• Conduct rigorous vulnerability scans and comprehensive risk assessments.
• Evaluate new security solutions to strengthen the overall system architecture.

Compliance & Documentation

• Guide systems through the full RMF Authorization to Operate (ATO) lifecycle.
• Author System Security Plans (SSPs) and Risk Assessment Reports.
• Maintain precise Security Control Traceability Matrices (SCTMs) and A&A packages.

Configuration & Integrity Control

• Administer strict Configuration Management (CM) for software, hardware, and firmware.
• Audit security controls to confirm baseline integrity across enclaves.
• Analyze the security impact of proposed technical system changes.
• Collaboration & Improvement
• Provide technical guidance on complex security policies to stakeholder groups.
• Proactively hunt for weaknesses and deploy strategic solutions to raise resilience.
• Partner with engineering teams to embed security best practices early.

Bachelor’s Degree (Computer Science, Cybersecurity, IA, or related) + 2+ years of relevant experience. OR Master’s Degree (Computer Science, Cybersecurity, IA, or related) + 0+ years of experience. or High School Diploma / Equivalent + 6+ years of direct experience (considered case-by-case).

Required Certifications:

DoD 8140 Compliant at IAM Level I/II or IAT Level III (e.g., CISSP, CASP or SecurityX, Security+).

Core Competencies:

Excellent interpersonal communication skills.

Strong organizational and goal-oriented focus.

Critical-thinking, collaborative, team-first mindset.

Security Clearance Requirement: Active TS/SCI with Polygraph required

Desired Qualifications:

Familiarization with Information Assurance software tools (e.g., Nessus, Splunk, ServiceNow, XACTA, eMASS).

Direct or indirect exposure to the specific customer domain and operating environment.

Prior technical background in System Administration, Network Engineering, or Systems Engineering.

At Leidos, we offer competitive benefits, including Paid Time Off, 11 paid Holidays, 401K with a 6% company match and immediate vesting, Flexible Schedules, Discounted Stock Purchase Plans, Technical Upskilling, Education and Training Support, Parental Paid Leave, and much more. Join us and make a difference in National Security!, Pay and benefits are fundamental to any career decision. That’s why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at www.leidos.com/careers/pay-benefits .

Leidos has a new and exciting opportunity for a Junior Information Systems Security Officer (ISSO) in our Intelligence Sectors, Cyber & Analytics Business Area (CABA). Our talented team is at the forefront in Security Engineering, Computer Network Operations (CNO), Mission Software, Analytical Methods and Modeling, Signals Intelligence (SIGINT), and Cryptographic Key Management., Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com .