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Senior Information System Security Engineer

Leidos · United States · $108k – $195k · posted today ago

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About this role

More About the Role:
Leidos is seeking a Senior Information System Security Engineer (ISSE) to support cybersecurity authorization related efforts for SMIT. SMIT is the largest IT services program for the Navy. Under the Service Management, Integration, and Transport (SMIT) program, the Leidos team will deliver the core backbone of the Navy's enterprise network (NMCI), including cybersecurity services, network operations, service desk, and data transport. Ultimately, the Leidos team will support the Navy in unifying its shore-based networks and data management to improve capability and service while also saving significant dollars by focusing efforts under one enterprise network.

What You'll Get to Do:
The ISSE will perform cybersecurity authorization services, including acting as a main point of contact for cybersecurity authorization related aspects to the assigned information systems, ensuring systems are maintained per security policies and procedures and maintaining compliance and ongoing reporting to management.

Responsibilities include:

You'll Bring These Qualifications:
•Bachelor's degree and 8-12 years of prior relevant experience or Master's with 6-10 years of prior relevant experience in Cybersecurity, Information Security, IT, EE, Network Engineering, Computer Science, or related field.
•Must be a US Citizen and possess an active DoD Secret Clearance.
•Hold an active security certification that meets DOD 8570 IAT level III or higher.
•Must have complete understanding of the RMF steps, especially Steps 4 through Steps 7.
•Ability to identify upon review of a system authorization boundary and its components to identify all applicable STIGs.
•Ability to decompose a security control/security check and ensure the provided artifact and test result satisfies said control/AP/check.
•Understanding of techniques and tactics used to exploit systems (MITRE ATTACK) to determine risk and possible mitigations.
•Ability to understand technical mitigations/know resources to identify proper mitigating factors (i.e.
with eMASS to include control inheritance, TR Import, and POAM import functionality.
•Support conducting cybersecurity authorization activities to comply with all current Cybersecurity and IA manuals, instructions, and guides within the DoDI 8500.01, DON 5239, the RMF Process Guide, and the RMF Risk Assessment Guide.
•Verify patch compliance using the approved technical solution (i.e., Assured Compliance Assessment Solution (ACAS)), Information Assurance Vulnerability Alert (IAVA) compliance dashboards, and Microsoft Defender for Endpoints.
•Assist with the implementation of security procedures, and verify information system security requirements, including coordinating the execution, review, and disposition of Security Technical Implementation Guide (STIG) checklists for systems, applications, developed code and other components.
•Independently develop and maintain system security documentation, including drafting, reviewing, editing and recommending guidance for Standard Operating Procedures (SOP), Tactics, Techniques, & Procedures (TTP), Plan of Action and Milestones (POA&M) and Federal Information Security Management Act (FISMA) Score Card.
•Assist with the development and application of business processes to ensure they have the appropriate level of security.
•Discuss and document the Ports, Protocols and Services (PPS) to include ensuring the dataflows are accurate, CAL boundaries crossed are compliant, and registrations with the AO are completed per DODI 8551.1
•Hands-on experience with a variety of cybersecurity tools.
•Hands-on experience in working with DoD networks.
•Experience in FISMA and other information assurance assurance-related compliance reporting.

•Attention to detail is a must.

These Qualifications Would be Nice to Have:

•Top Secret Clearance.

•Willing to perform shift work.

NGEN

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 5, 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.

Originally posted on Himalayas

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Senior Information System Security Engineer at Leidos — Remote | 101 Careers