Leidos is seeking an **Information System Security Officer (ISSO)**with an active DoD TS/SCI clearance to join our team in Suitland, MD. In this role, you will provide your Information Assurance and Systems Accreditation experience to support the customerand play a vital role in developing solutions that impact mission goals and objectives. In this role, you’ll have the freedom to work individually and the opportunity to resolve highly complex problems using a significant application of technical knowledge, conceptualizing, reasoning, and interpretation of facts and requirements.

As key member of the Information Assurance team, you will be part of a group of highly skilled professionals responsible for providing the preparation and shepherding of Assessment and Authorization packages based on inputs from the Government Program Managers, Enterprise Cyber leaders, Information Systems Security Engineers (ISSE), System Administrators, Developers and Database Administrators and engineers in accordance with the requirements stated in the Risk Management Framework and guidance provided in the Navy Authorizing Official approved A&A process.

Your daily activities will directly impact real-world operations and assist in implementing and leveraging the latest capabilities of various cutting-edge systems and develop technical solutions to problems that are complex and not always immediately identifiable to timely meet customer’s objectives. This is an opportunity you won't want to miss! Join us today and be part of a dynamic team dedicated to making a difference.

Primary Responsibilities:

• Ensure full Accreditations and issuance of Authority to Operate are established and maintained continuously for a single specialized network enclave comprising of over a dozen network devices and two customer specific applications.
• Ensure that on-premises systems are in full compliance with all applicable security accreditation or authorization requirements and best practices as prescribed by Office of the Director of National Intelligence, Defense Intelligence Agency, Department of Defense, Defense Information Systems Agency, Navy, Naval Intelligence Activity and local authorities.
• Prepare all necessary security documentation to ensure the successful completion of security testing & evaluation and accreditation for related systems.
• Conduct and report results of security-related analyses, evaluations, risk assessments, and other activities supporting requirements to update or establish new Systems or Applications.
• Attend Cybersecurity policy implementation meetings and briefings, and develop, provide, and deliver technical, operator, and customer training and briefings as required by the approving authority or as requested by Government Lead(s).
• Document results of security analysis, evaluations, alternatives analyses, risk assessments, and other security-related activities performed in support of project orders and as tasked for approved project.

Basic Qualifications:

• Bachelor’s degree in a related field and 8+ or 12+ years of related work experience or a Master's degree with 6+ or 10+ years of related work experience. Additional experience may be considered in lieu of a degree.
• Active DoD Top Secret/SCI clearance.
• A current IAT or IAM Level III DoD Approved 8570 Baseline Certification (e.g., CASP+ CE, CISSP) or higher or the ability to obtain within 30 days of an offer acceptance.
• Demonstrated strong experience in the following:Risk Management Framework (RMF), A&A and ATO processes.
• System/software design, enterprise architecture security, integration, testing, system administration, application administration, training, deployment, and O&M.
• Security requirements analysis, evaluations, alternatives analyses, and risk assessments for networks and applications.
• Ability to write and speak clearly when exchanging information with customers in person, e-mail, web-based text chat, or other written documents.
• Up to 10% travel may be required in the within the National Capitol Region.
• Experience utilizing the Xacta database system.

NITESONI

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:

March 27, 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.