Senior Information Security Systems Engineer

Leidos is seeking a qualified Senior Information Systems Security Engineer (ISSE) to serve as the cybersecurity contact responsible for ensuring that assigned federal information systems comply with applicable agency security policies standards and regulatory frameworks such as FISMA and the NIST Risk Management Framework (RMF).

This role includes maintaining and managing the System Security Plan (SSP) and all associated in scope authorization documentation ensuring systems remain secure throughout their lifecycle. The ISSE provides technical and strategic leadership in system authorization risk management and continuous monitoring activities. Join us at AEGIS where the sky is NOT the limit!

Primary Responsibilities

• Serve as the principal security advisor to the ISO for assigned information systems within a federal environment ensuring compliance with NIST SP 800-53 NIST SP 800-37 and agency-specific security requirements.
• Update and maintain the System Security Plan (SSP) ensuring that control implementations system descriptions and security boundaries are accurately documented and kept current.
• Coordinate with system owners administrators and engineering teams to ensure system configurations and operations align with the approved SSP.
• Lead and manage the Authorization to Operate (ATO) process including preparation of risk assessments Security Assessment Reports (SARs) Plans of Action and Milestones (POA&Ms) and continuous monitoring artifacts.
• Conduct periodic reviews and updates of SSPs and related security documentation to reflect system changes audit findings or emerging threats.
• Oversee the implementation and assessment of security controls in accordance with the NIST RMF.
• Provide guidance on risk mitigation strategies and assist with remediation efforts following audits or assessments.
• Lead continuous monitoring efforts including vulnerability management incident response coordination and control effectiveness tracking.
• Prepare and deliver security status reports risk summaries and compliance briefings to senior leadership and agency stakeholders.
• Mentor junior ISSOs and serve as a subject matter expert in federal cybersecurity compliance and authorization processes.
• Support annual security plan testing and auditing in collaboration with the Information System Security Officer.
• Provide configuration and implementation control information to security stakeholders in support of POA&Ms RBDs and annual security plan audits.

Basic Qualifications

Preferred Qualifications

Desired Certifications / Training :

If youre looking for comfort keep scrolling. At Leidos we outthink outbuild and outpace the status quo because the mission demands it. Were not hiring followers. Were recruiting the ones who disrupt provoke and refuse to fail. Step 10 is ancient history. Were already at step 30 and moving faster than anyone else dares.

Original Posting : November 14 2025

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 $104650.00 - $189175.00

The Leidos pay range for this job level is a general guideline onlyand 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.

Required Experience :

Senior IC

Key Skills

International Development,Access Control System,Finance Control,Informatica,Information Technology Sales,Asp.Net MVC

Employment Type : Part-Time

Experience : years

Vacancy : 1

Monthly Salary Salary : 104650 - 189175