Senior Information System Security Officer

General Information

• Requisition: R66875
• Locations: USA-DC-Washington
• Posting Date: 03/27/2026
• Security Clearance Required: TSSCI
• Remote Type: Onsite
• Time Type: Full time

Description & Requirements Unlock the secrets of intelligence with MANTECH. Join a dynamic team at the forefront of national security providing advanced solutions to government intelligence agencies. Since 1968, weve been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics, and Software Development. Elevate your career and make a difference. Your adventure begins now-unleash your potential with MANTECH.

MANTECH seeks a motivated, career and customer-oriented Senior Information System Security Officer (ISSO) to join our team in Washington, DC.

Responsibilities include but are not limited to:

• Ensure the day-to-day implementation oversight, continuous monitoring, and maintenance of the security configuration practices and procedures for each IS, and that selected security controls are implemented and operating as intended during all phases of the IS lifecycle.
• Provide liaison support between the system owner and other IS security personnel.
• Ensure that system security documentation is developed, maintained, reviewed, and updated on a continuous basis.
• Conduct required IS vulnerability scans according to risk assessment parameters.
• Manage the risks to ISs and other FBI assets by coordinating appropriate correction or mitigation actions and oversee and track the timely completion of POAMs. Coordinate system owner concurrence for correction or mitigation actions.
• Monitor security controls for FBI ISs to maintain security Authorized to Operate (ATO).
• Upload all security control evidence to the Governance, Risk, and Compliance (GRC) application to support security control implementation during the monitoring phase.
• Ensure that changes to an FBI IS, its environment, and/or operational needs that may affect the authorization status are reported to the system owner and IS Security Manager (ISSM).
• Ensure the removal and retirement of ISs being decommissioned in coordination with the system owner, ISSM, and ISSR.

Working knowledge of the National Institute of Standards and Technology (NIST) Risk Management Framework (RMF) and ATO processes is required.

Minimum Qualifications Must meet one of the following levels of experience:

• A high school diploma/GED and 7 years experience.
• A bachelors degree in computer science, cybersecurity, or a related discipline and five years experience.
• A masters degree in computer science, cybersecurity, or a related discipline and 3 years experience.

Hold at least one of the following Information Assurance Management (IAM) Level III certifications:

• Certified Information Systems Security Professional (CISSP)
• Global Information Security Professional (GISP)
• CompTIA Advanced Security Practitioner (CASP)
• Or equivalent certifications.

Familiarity with the use and operation of security tools including Tenable Nessus and/or Security Center, IBM Guardium, HP WebInspect, Network Mapper (NMAP), and/or similar applications.

Preferred Qualifications

• A bachelors or advanced degree in Computer Science, Cybersecurity, or other cyber discipline.

Clearance Requirements

• Must be a US Citizen and have a current/active Top Secret clearance with SCI eligibility.
• Program may require CI Polygraph.

Physical Requirements

• Must be able to remain in a stationary position 50%.
• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
• Constantly operates a computer and other office productivity machinery such as a calculator, copy machine, and computer printer.
• Often positions self to maintain computers in the lab, including under the desks and in the server closet.
• Frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.

Compensation & Benefits The projected compensation range for this position is $141,500.00 - $236,000.00. There are differentiating factors that can impact a final salary/hourly rate including but not limited to:

• Contract Wage Determination
• Relevant work experience, skills, and competencies that align to the specified role
• Geographic location
• For Remote Opportunities: education and certifications as well as Federal Government Contract Labor categories.

In addition, MANTECH invests in its employees beyond just compensation. MANTECHs benefits offerings include (dependent upon position):

• Health Insurance
• Life Insurance
• Paid Time Off
• Holiday Pay
• Short-term and long-term Disability
• Retirement and Savings
• Learning and Development opportunities
• Wellness programs
• As well as other optional benefit elections.

Equal Opportunity Statement MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

Accommodation If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.