Apr 20, 2023

Sr. Information System Security Officer (ISSO)

  • Leidos
  • Alexandria, VA, United States
Full time Information Technology

Job Description


Leidos is seeking a Sr. Information System Security Office (ISSO) to support a large enterprise IT contract for the DOD. The ISSO will be responsible for reviewing and maintaining existing Authority to Operate (ATO) documentation throughout the sustainment portion of the system lifecycle. They will utilize the XACTA system to update documentation in the Risk Management Framework (RMF) System Security Package (SSP), verify systems are operating in their intended manner, and validate administrator permissions and access to systems under their purview

This role requires an individual that is familiar with security accreditation frameworks and directives (e.g. NIST, RMF, Common Criteria, DoD, and Intelligence Community Directives (ICDs)) and works to mitigate risks by applying security controls effectively to maintain an acceptable degree of operational risk across multiple enclaves in an enterprise environment. The ISSO will promote security best practices, identify and articulate process improvement and procedures updates, and conduct testing and assessments to sustain required accreditations. Additionally, the ISSO will assist with tracking, documenting, and remediating vulnerabilities identified by the customer’s Cyber Security division and direct remediation efforts for system administrator staff, provide status updates to government and program leadership, and update relevant RMF packages as required.

Primary Responsibilities:

• Author, review, and update accreditation packages and supporting documentation to maintain existing ATO state for all systems operating in the production environment that follow all government, IC, DoD, DISA, NIST, or industry standards and policies

• Review documentation provided by the customer’s Engineering division as part of the initial ATO package to validate all documents are available and useable in their current state

• Maintain SSPs and related configuration records in customer’s XACTA system and Service Now or other CMDB tool

• Develop, monitor, and update Plan of Action & Milestones (POA&Ms) to document open risks and vulnerabilities through remediation or mitigate

• Can work independently as well as collaboratively to drive security process improvements to streamline the process, increase the security posture of the enterprise, and ensure due diligence at all times

• Comfortable communicating officially and unofficially via briefings, meetings, emails, or other collaboration technologies, with Leidos program leadership and government leadership

• Has in-depth understanding of information security technical principles, theories, concepts and their application across a range of enterprise services and systems

• Coordinates all A&A renewal activities with the DAO, DAOR, or other representatives from the Cyber Security division to maintain proper accreditation throughout the life of the system 

• Review, update, and maintain CONOPs, Disaster Recovery, and other required plans for each system to reflect the evolving enterprise

• Coordinate with System Administrators and other operations and engineering staff to remediate all vulnerabilities and report results to the Cyber Security division.

• Document, track, and obtain approvals for open vulnerabilities that cannot be remediated through the use of POA&Ms, Risk Acceptance requests, or other customer-mandated processes and forms

• Mentor coworkers, system administrators, program and government leadership on evolving security best practices and potential impacts on production systems

Basic Qualifications:

• Practical experience understanding and applying ICD-503 Risk Management Framework

• Experienced with XACTA to track, document, and validate accreditation packages

• Understanding of DoD and IC security policies and mandates

• Experienced with reviewing existing ATO documentation, identifying missing or outdated information, and coordinating with relevant support teams to obtain necessary information

• Time management skills

• Strong oral and written communications skills

• Track record of working effectively individually, with peers, and with outside support elements

• Experience with IT Service Management ticketing systems such as Service Now

• Candidate must, at a minimum, meet DoD 8570.11- IAT Level II certification requirements (currently Security+ CE, CCNA-Security, GSEC, or SSCP)

• Candidate must have a Bachelor's degree with 8 or more years of relevant experience.


• Due to the nature of the government contracts we support, US Citizenship is required.

• TS/SCI with a Poly is required for this position or TS/SCI and willingness to get a Poly.

Desired Certifications:

• Active Certified Information Systems Security Professional (CISSP) or ISACA Certified Information Security Manager (CISM)

Pay Range:

Pay Range $97,500.00 - $150,000.00 - $202,500.00

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.

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