Senior Information System Security Engineer

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: •Serve as a primary information system security engineer (ISSE) for Authorization to Operate (ATO) packages under the Navy Risk Management Framework (RMF). •Assist in the development and review of ATO submissions and coordinate all updates and corrections to assessment and authorization (A&A) artifacts. •Evaluate software and hardware during pre-acquisition phases to determine its ability to meet minimum security requirements based on NIST SP 800-53 Rev 5 security controls. •Author, review, coordinate and submit cybersecurity authorization required artifacts to eMASS (including change requests) to achieve milestones such as Interim Authority to Test (IATT) and ATO in accordance with the project schedule. •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. •Continuously monitor system resources through automated scanning and implement automated reporting feeds to support cybersecurity authorizations. •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. •Coordinate with local administrators to troubleshoot and elevate patching issues in a timely manner in order to meet patch compliance timelines. •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. •Participate in regular briefings with the customer on cybersecurity statuses, including preparing briefing materials. Work closely with government Cyber team to support ATO conditions and requirements. •Support site visits / audits, including System Readiness Reviews (SRR). •Ensure secure, effective and efficient operation of network systems, architecture, and topology. •Assist with the development and application of business processes to ensure they have the appropriate level of security. •Participate in strategic network, security, and operations new technology planning. •As a cybersecurity authorization services security expert, assist the engineering managers in employing approved defense-in-depth principles and practices (e.g., defense-in-multiple places, layered defenses, and security robustness) •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. •Develop innovative solutions to complex, cross-discipline cybersecurity authorization challenges spanning multiple technical areas. •Serve as a technical point of contact with external stakeholders, including subcontractors and vendors, on cybersecurity authorization matters. •Influence project and government team leadership on ISSE solution design, process, and approach decisions.

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.

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 .

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com .

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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.

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