Leidos is seeking an Information System Security Officer (ISSO) to collaborate with the Information System Security Manager (ISSM) managing risks related to the use of processing, storing, or transmitting information to reduce or eliminate impact to confidentiality, integrity, or availability of information and information systems. 

Primary Job Responsibilities:

• Ensuring appropriate operational security posture is maintained.
• Conducting scheduled weekly, monthly, quarterly and annual Continuous Monitoring and auditing tasks and reporting.
• Implementing and enforcing all applicable cybersecurity policies, procedures, and countermeasures.
• Developing and implementing automated processes for systems monitoring.
• Working with Program Security to ensure all users have requisite security clearances and access authorization.
• Maintaining all authorized user access control documentation IAW applicable ICD 503 and DoD Risk Management Frameworks
• Ensuring software, hardware, and firmware comply with appropriate security configuration guidelines (e.g., Security Technical Implementation Guides (STIGs)/Security Requirement Guides (SRGs).
• Ensuring proper configuration management procedures are followed prior to implementation and contingent upon necessary approval.
• Initiating exceptions, deviations, or waivers to cybersecurity requirements.
• Implementing and enforcing all DoD cybersecurity policies and procedures, as defined by cybersecurity-related documentation.
• Initiating protective or corrective measures in the event of a cybersecurity incident.
• Ensuring all DoD cybersecurity-related documentation is current and accessible to properly authorized individuals.
• Developing artifacts and supporting evidence to satisfy all applicable RMF Controls.
• Conduct risk assessments and vulnerability analyses to identify security weaknesses and recommend mitigation strategies.
• Prepare and maintain security documentation, including System Security Plans (SSPs), Security Assessment Reports, and Plans of Action and Milestones (POA&Ms).  
• Coordinate and support security authorization activities, such as Assessment and Authorization (A&A) or Authority to Operate (ATO) processes.
• Manage ATO package in eMASS to include updating security controls, importing ACAS scans and STIG checklists

Basic Qualifications:

• Bachelor of Science degree with 4+ years of relevant experience or a Masters Degree with 2+ years of relevant experience.
• Minimum of 4+ years of ISSO experience is required.
• US Citizen with a Secret clearance eligibility on date of employment.
• Must possess knowledge and experience using NISTSP 800-53 Rev 4, NISTSP 800-53 Rev 5 and CNSSI 1253
• Must possess current DOD 8140 certification

Preferred Qualifications:

• Previous experience with eMASS to maintain ATO package
• Interpersonal skills to interface with key stakeholders
• Extensive working knowledge of Risk Management Framework (RMF) and Assessment and Authorizations (A&A) is highly desired

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.

Original Posting:

August 27, 2025

Pay Range:

Pay Range $85,150.00 - $153,925.00

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.