Information Systems Security Manager (ISSM)

Leidos has a new and exciting opportunity for a Information Security Systems Manager (ISSM) in our INTEL Sector's 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.

• 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! Information System Security Manager (ISSM) will support the CEMA team whose primary customer is PAE-Fires. The ISSM will oversee the cybersecurity posture of a primarily software based tactical based intrusion detection tool custom built for DoD information systems, ensuring compliance with DoD security standards and protecting sensitive data. The ISSM will develop and implement security policies, oversee and facilitate risk assessments, manage system accreditations (RMF), and lead continuous monitoring efforts as appropriate. This role requires collaboration with cross-functional teams and program stakeholders to enforce security controls and manage continuous monitoring. The ISSM will also maintain security documentation and ensure ongoing compliance with applicable regulations. This position will require 100% on-site work located in Huntsville, AL with no remote work supported

Primary Responsibilities

• Act as the Subject Matter Expert (SME) on cybersecurity compliance / information assurance for the CEMA program.
• Facilitate approval process for Authorization to Operate (ATO), or any Interconnection Security Agreements (ISA), working with the customer and stakeholders to submit artifacts and receive AO endorsement.
• Collaborate with assigned ISSOs and Cyber Security Engineers within other programs and at the PAE-Fires CIO office to execute the continuous monitoring process with full system observability.
• Oversee software development-based security scans of the code for the product offering / development environment.
• Assist with the cybersecurity posture of associated networks at events as assigned by customer tasking.
• Develop, implement, and maintain security policies, procedures, and documentation to ensure compliance with DoD security standards and regulations (e.g., NIST, RMF, FISMA).
• Guide and direct other program teams to produce necessary artifacts for compliance with DoD security standards and regulations of the same.
• Perform risk assessments, vulnerability assessments, and security audits upon request to identify system vulnerabilities and provide remediation strategies.
• Ensure the accreditation process for DoD systems (e.g., RMF accreditation) is completed and maintained in compliance with all applicable requirements.
• Act as the primary point of contact for IT security-related topics, coordinating incident response and reporting to senior management and government customers.
• Maintain and track security documentation, including system security plans (SSPs), risk assessments, and Plan of Actions & Milestones (POA&Ms).
• Stay current with emerging cybersecurity threats, vulnerabilities, and trends to ensure the program adapts to evolving security challenges.

Basic Qualifications

• US Citizen with an active Secret clearance and the ability to obtain a TS/SCI Bachelor’s Degree with 8+ years of experience or Master’s degree with 6+ years of experience.
• Additional experience may be considered in lieu of a degree.
• Up to date current cybersecurity certification (CISSP, CISM, or similar).
• In-depth knowledge of DoD cybersecurity policies, frameworks, and compliance standards (e.g., NIST 800-53, RMF, FISMA, ICD 503, JSIG).
• In-depth experience building/maintaining an ATO (especially for software product offerings).
• Experience with system security engineering, risk management, and vulnerability assessments.
• Strong understanding of cloud security, network security, security controls, and common cybersecurity tools (e.g., firewalls, IDS/IPS, SIEM, endpoint protection).
• Ability to work independently and collaborate effectively with cross-functional teams.
• Strong communication skills, including the ability to create and present detailed security reports to stakeholders.

Preferred Qualifications

• Experience in managing security for DoD programs or software product offerings.
• Experience with security tools for software development vulnerability scanning, penetration testing, and security auditing.
• Advanced security certifications (e.g., CISA, CEH, CSSP, etc.).
• Experience with configuration management and change management processes in a secure environment.

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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: October 6, 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 $107,900.00 - $195,050.00

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.

Leidos 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 $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit

Pay and Benefits 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 here.

Securing Your Data

Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to View email address on click.appcast.io.

Commitment and Diversity

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.