Senior Information System Security Engineer (ISSE) with Security Clearance

Amentum is seeking a Senior Information System Security Engineer (ISSE) to support Program Offices within Department of War Strategic Systems Programs (SSP). The ISSE will support non-enterprise information systems of large-scaled programs of record (POR), as well as multiple Science and Technology (S&T) programs. The Senior ISSE will provide direct support to the Program Office Technical Lead onsite at NSWC Crane and will be expected to travel regularly to SPHQ or Field Activities.

The ISSE will ensure Cybersecurity requirements support system acquisition, development, test, and sustainment, and are embedded in SSP system designs. Their duties involve requirements analysis, design, development, implementation, and integration of Cybersecurity system architectures that provide cyber resiliency and Cybersecurity capabilities into SSP's non-enterprise systems. They are responsible for ensuring that design alternatives are selected that appropriately account for risk to mission regarding the cyber security posture.

Additional Job Duties and Responsibilities

• Develop and apply requirements for large-scale or service specific pilot projects.
• Support the Program Office Technical Lead as needed identifying issues and action items and participating in ISSE discussions.
• Provide customer interactions with Program Offices and associated contractors/subcontractors. Customer interactions will be a combination of teleconferences and on-site meetings.
• Coordinate and collaborate with the stakeholders, including SSP representatives and contractors/subcontractors through assessments, subject matter expert input to proposals, technical interchange meetings, status teleconferences, email correspondence, and other meetings as required.
• Support development of technical presentations and provide comments on the technical content.
• Develop System Security Plans detailing the security controls implemented for each information system.
• Support (prepare, review, and present) the Program Office's DoW Acquisition process in the development of the Objective Quality Evidence (OQE) (i.e. Cyber Security Strategy, GAO responses,
• Clinger Cohen Act, Cyber Test & Evaluation Strategy, etc.) for multiple programs, in compliance with SSP Regulations.
• Work with SSP programs to develop and maintain lifecycle plans.
• Evaluate performer deliverables and presentations.

Required Qualifications

• Bachelor of Science Degree in Electrical Engineering, Computer Engineering, or equivalent, with 5+ years of relevant experience
• CompTIA Security+ or equivalent certification
• Operating System/Computing Environment (OS/CE) certificate of training, as dictated by Command CWF-PM.
• Collaborate with large and highly competent technical teams.
• Strategic high-level thinking
• Ability/experience with planning an initiative involving large-scale, networked systems.
• Must have the ability to obtain and maintain a TS/ CNWDI US Government Clearance. Interim Secret clearance required to start. Please note US Citizenship is required to obtain a Secret/ TS/ CNWDI Clearance.
• Willing and able to travel 40% or more.

Preferred Qualifications

• 10+ years of relevant experience
• Graduate degree in Cybersecurity, Certified Information Systems Security Professional (CISSP) certification, or Certified Information Security Manager (CISM) certification
• Active Top Secret Clearance
• Military and Department of War Strategic Systems Programs (SSP) experience Compensation Details:

$100,000.00-$150,000.00 annually The compensation range or hourly rate listed for this position is provided as a good-faith estimate of what the company intends to offer for this role at the time this posting was issued. Actual compensation may vary based on factors such as job responsibilities, education, experience, skills, internal equity, market data, applicable collective bargaining agreements, and relevant laws.

Benefits Overview: Our health and welfare benefits are designed to support you and your priorities. Offerings include:

• Health, dental, and vision insurance
• Paid time off and holidays
• Retirement benefits (including 401(k) matching)
• Educational reimbursement
• Parental leave
• Employee stock purchase plan
• Tax-saving options
• Disability and life insurance
• Pet insurance Note: Benefits may vary based on employment type, location, and applicable agreements. Positions governed by a Collective Bargaining Agreement (CBA), the McNamara-O'Hara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting

10/29/2026 - Until Filled
Amentum anticipates this job requisition will remain open for at least three days, with a closing date no earlier than three days after the original posting. This timeline may change based on business needs. Amentum is proud to be an

Equal Opportunity Employer. Our hiring practices provide equal opportunity for employment without regard to race, sex, sexual orientation, pregnancy (including pregnancy, childbirth, breastfeeding, or medical conditions related to pregnancy, childbirth, or breastfeeding), age, ancestry, United States military or veteran status, color, religion, creed, marital or domestic partner status, medical condition, genetic information, national origin, citizenship status, low-income status, or mental or physical disability so long as the essential functions of the job can be performed with or without reasonable accommodation, or any other protected category under federal, state, or local law. Learn more about your rights under Federal laws and supplemental language at Labor Laws Posters .