Information System Security Engineer

Description The Defense Sector at Leidos is looking for an Information System Security Engineer (ISSE) to support a fast-paced program with Air Force Life Cycle Management Center. The ISSE will provide comprehensive Cyber Infrastructure Support to a weapons system program with the Air Force. This role is critical in ensuring the security and integrity of program IT infrastructure, protecting sensitive data, and mitigating cyber threats. The ideal candidate will have a strong technical background in cybersecurity principles, tools, and best practices.As the ISSE, you will lead the design, implementation, and governance of security solutions across our enterprise environments. This role is pivotal in ensuring the confidentiality, integrity, and availability of cloud-hosted assets while enabling secure innovation at scale by working closely with cloud engineers, cybersecurity analysts, and program leadership to drive continuous improvement and deliver value to the mission.Primary Responsibilities:Help design an implement secure cloud infrastructure across platforms.Define and enforce cloud security policies, standards, and automation frameworks.Take part in threat modeling, risk assessments, and incident response for cloud-native applications and services.Integrate security into CI/CD pipelines and DevOps workflows.Support cloud identity and access management (ICAM), encryption, and key management systems.Monitor cloud environments using SIEM, CSPM, CWPP, and other security tools.Configure, tune, and monitor enterprise security toolsMonitor network and system security to identify and respond to vulnerabilities and incidents.Conduct risk assessments and develop strategies to mitigate identified risks.Collaborate with IT teams to ensure the integration of security measures into all infrastructure projects.Develop and implement security policies, standards, and procedures to protect sensitive information.Provide technical support and guidance on cybersecurity tools and technologies.Stay updated on emerging cybersecurity threats and industry trends to enhance the organization's security posture.Develop and refine documentation to gain and maintain DoD accreditation for the systems on the programBasic Qualifications:US Citizen with the ability to obtain a TS/SCI clearance prior to your start date with Leidos.Bachelor’s degree with 2+ years of experience or Master’s degree. Additional experience may be considered in lieu of a degree.Proven experience in cybersecurity engineering or related roles.Hands-on experience with configuring cybersecurity tools and software for enterprise use, with a specific focus on Splunk, HBSS/ESS (Trellix), and ACAS (Nessus)Familiarity with DoD cybersecurity frameworks such as Risk Management Framework (RMF)Strong knowledge of network security, firewalls, intrusion detection/prevention systems, and encryption technologies.Excellent problem-solving skills and attention to detail.Strong communication skills for collaborating with technical and non-technical stakeholders.Preferred Qualifications:DoD 8570 IAT Level II, IAM Level I, or DoD 8140 Intermediate certification or higher.Working knowledge of cloud security and securing cloud-based infrastructure.Experience securing classified DoD networks, such as networks connected to SIPR or JWICSKnowledge of cloud-native security information and event management (SIEM) toolsKnowledge of cloud-native endpoint security toolsFamiliarity with incident response processes and tools.Experience with scripting or automation tools for security tasks.Ability to work in a dynamic environment and adapt to changing priorities.Experience using and interpreting vulnerability assessment or scanning toolsExperience with Agile framework and DevSecOpsIf 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:May 5, 2026For 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 - $125,725.00The 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.About LeidosLeidos 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 .Pay and BenefitsPay 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 at /careers/pay-benefits.Securing Your DataBeware 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 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 [email protected] you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.Commitment to Non-DiscriminationAll 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.

Created: 2026-05-05