Junior Information Systems Security Officer (ISSO)

About this role

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.

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!  

Job Summary: 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.

Responsibilities include: 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.

Basic Qualifications Education: 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.

conmd KQW If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting: August 31, 2026 For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range: Pay Range $69,550.00 - $125,725.00 The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.

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