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Join a Mission-Driven Team at Leidos:
At Leidos, we deliver cutting-edge solutions through the dedication of our diverse and talented workforce. United by a shared commitment to our customers’ success, we empower our teams, support our communities, and operate sustainably. Guided by our Mission, Vision, and Values, we strive to always do the right thing—for our customers, our people, and our world.
Ready for Your Next Career Challenge?
We’re seeking a dynamic and experienced Information System Security Officer (ISSO) to support a high-impact program providing Information Assurance services to the U.S. Space Force. This role offers a unique opportunity to contribute to a critical national defense mission while working in a fast-paced, innovative IT environment.
This position reports directly to the Program Manager.
Key Responsibilities:
Collaborate daily with the ISSM to provide expert cybersecurity guidance and recommendations
Oversee classified processing tasks, ensuring compliance with established standards
Conduct system audits and execute Continuous Monitoring (ConMon) activities
Lead and support the Risk Management Framework (RMF) authorization process, including development and maintenance of the Body of Evidence (BoE)
Manage Configuration Management (CM) activities for hardware, software, firmware, and security-relevant functions
Analyze vulnerability scans, implement DISA STIGs, and ensure secure system configurations
Interpret and apply DoD cybersecurity policies and procedures
Review and recommend remediation actions for Plan of Action and Milestones (POA&M) to mitigate risks and achieve Authorization to Operate (ATO)
Basic Qualifications:
Bachelor’s degree and 8 years of relevant experience (additional experience, training, and/or certifications may substitute degree requirement)
U.S. Citizenship; Currently possess an Active DoD Top Secret clearance with SCI eligibility
Proficiency with DCSA eMASS, SCAP, ACAS, and Nessus Network Monitor (NNM)
Strong understanding of RMF, SDLC, and A&A documentation development
Experience with DCSA and Special Access Program (SAP) A&A processes
Ability to apply government security regulations (FIPS, NIST, NISPOM, JSIG, ICDs) to information systems
Expertise in securing Windows, Linux, and UNIX environments using Active Directory and Group Policy
Exceptional analytical, problem-solving, and communication skills
Strong attention to detail and organizational discipline
Proven ability to manage multiple priorities independently
Must obtain DoD 8140 (DoD 8570.01) IAT II certification within 6 months of hire
Preferred Qualifications:
Experience with the implementation or both DoDD 8570 and DoDI 8140 certification processes
Experience supporting DoD customers and mission requirements
Hands-on experience with Trellix modules and SIEM solutions
Knowledge of DCSA XACTA and CORE platforms
RMF package development for NIPR, SIPR, and JWICS networks
Understanding of DoD military standards and operational environments
Ability to adapt to evolving mission needs and technical landscapes
This role is ideal for cybersecurity professionals who thrive in mission-critical environments and are passionate about protecting national assets. If you’re ready to make a meaningful impact, we’d love to hear from you.
At Leidos, we don’t want someone who "fits the mold"—we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, “what’s next?” before the dust settles on “what’s now.”
If you’re already scheming step 20 while everyone else is still debating step 2… good. You’ll fit right in.
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.
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.