Information Systems Security Officer

🚀 Cyber Security Engineer / ISSO – Protect and Strengthen Mission‑Critical Systems Leidos is seeking a Cyber Security Engineer / Information Systems Security Officer (ISSO) to support a high‑impact, mission‑essential program. In this role, you’ll work closely with the Information System Security Manager (ISSM) and system owners to ensure that critical IT systems remain secure, compliant, and resilient against evolving threats. If you’re driven by precision, cybersecurity excellence, and safeguarding national‑level systems, this position puts you at the center of the mission. You’ll apply your expertise in the Risk Management Framework (RMF), system hardening, and security assessments to help maintain compliance with DoDI 8510.01, while guiding teams through secure operations and continuous improvement. 🌐 What You’ll Do As a key cybersecurity leader, you’ll assess, secure, and monitor complex IT systems while shaping the security posture of the program. Your responsibilities include: Performing full ISSO duties by establishing and administering security systems, policies, and procedures in alignment with government directives and contractual requirements Conducting security audits and compliance checks under DoDI 8510.01 Performing risk and vulnerability assessments on Cisco, Juniper, Windows, and Linux systems Promoting security awareness and communicating deficiencies to the ISSM and ISSO team Recommending and implementing security programs to ensure users understand and follow cybersecurity policies Assessing security events, determining impact, and implementing corrective actions Ensuring rigorous application of cybersecurity principles across all IT services Supporting the development of RMF documentation, including SSPs, SOPs, POAMs, and security assessments This role is ideal for someone who thrives in a structured, high‑stakes environment and enjoys applying cybersecurity expertise to protect mission‑critical systems. 🎯 Required Qualifications & Skills You bring a strong cybersecurity foundation, hands‑on technical experience, and the ability to operate independently in a dynamic environment. Active DoD TS/SCI clearance Current DoD 8140‑compliant security certification; ability to obtain CE certification within 6 months Bachelor’s degree and 6+ years of cybersecurity ISSO experience (or equivalent experience/certifications) Strong understanding of cybersecurity policies, principles, and best practices Experience writing RMF package documentation Deep familiarity with DoDI 8510.01, NIST 800‑53, and the ATO process Experience with Assessment & Authorization (A&A) documentation and audits Knowledge of STIGs, CIS Benchmarks, and secure configurations Experience performing risk and vulnerability assessments and documenting remediation steps Familiarity with automated scanning tools such as Tenable Nessus, SCAP, or similar Experience participating in security evaluations, audits, and reviews Ability to learn new technologies and adapt quickly Strong written and verbal communication skills Ability to manage multiple tasks in a fast‑paced environment ⭐ Preferred Qualifications These skills will help you stand out: Industry certifications such as CySA+, CASP+, CISSP, or equivalent Experience securing complex network topologies Familiarity with Agile methodologies (SCRUM, Kanban) Experience with Atlassian tools (JIRA, Confluence, Bitbucket) Experience with Splunk, Tenable Nessus, SCAP tools Linux and Windows administration experience Ability to navigate Linux directories and execute scripts 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 26, 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 $87,100.00 - $157,450.00 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.