Information System Security Engineer - Senior

Purpose and Impact In support of a challenging critical and rewarding program that provides integrated voice, video, and data services throughout the Information Technology lifecycle, Amentum is seeking a Senior Information System Security Engineer to join our dynamic team of IT professionals dedicated to fostering a positive and collaborative work environment. You must be a critical thinker, have a strong work ethic, and be able to work independently or as a member of a team in a dynamic environment. We value candidates who are detail-oriented while also being able to think and react quickly to emerging and unique problem sets. To be successful, you must be able to rapidly adapt and learn how to operate the front and back end of new products and processes.

Work Schedule

• 5 Days: Mon - Fri
• 8 hrs/day
• 40 hrs/wkly

Essential Responsibilities The duties and responsibilities of the Senior Information Systems Security Engineer include but are not limited to the following:

• Experience creating custom dashboards, writing queries, building and generating reports, and setting up alerts and notifications using all the Cyber tools: Splunk, Tenable, Trellix.
• Demonstrated proficiency with recognizing and onboarding new data sources into the cyber tools and analyzing the data for anomalies and trends.
• Primarily responsible for maintaining the test and operational environments to include all cybersecurity tool sets and collaborating with systems and network engineers.
• Use knowledge, skills, and ability to conduct research for designing, integrating, and implementing security controls into current and future products/systems, thus ensuring these systems can be accredited based on compliance with the Joint Special Access Program Implementation Guide (JSIG).
• Recommend the components to implement system security requirements using intimate knowledge of security design best practices for information systems throughout the system development life cycle to support the generation of security engineering products.
• Assist with the design, deployment, and administration of a multi-site distributed Splunk environment, including:
• Multi-site Clustering
• Search Head Clustering
• Universal Forwarders
• Deployer and Deployment Server
• Configure, operate, and maintain Trellix and its components:
• ePolicy Orchestrator
• Trellix Agent
• Data Loss Prevention
• Host Intrusion Prevention System
• Policy Auditor
• Asset Baseline Monitor
• Virus Scan Enterprise (on Windows and Linux)
• Creating exceptions to allow essential processes to continue uninterrupted.
• Administration/operation of information security compliance tools/platforms with a special concentration in managing Tenable Security Center and NESSUS.
• Provide Tier 1, 2, and 3 maintenance support for deployed cyber security technologies.
• Assist with periodic and regular security assessments.
• Assist with the development and maintenance of information security policies, standards, and control procedures to enable compliance with RMF.
• Assist with POA&M management, mitigation statement formulation, and interfacing with system administrators to resolve open findings of high and at-risk systems.
• Perform security assessments on hardware/software products to include physical, virtual, boundary, and security appliances.
• Implement continuous monitoring tools and processes, development of improvements to security assessments regarding accuracy and efficiency, as well as integration of new techniques to improve the confidentiality - integrity - availability of network/operational systems at multiple classifications levels.

Minimum Requirements: Knowledge, Skills, and Abilities

• Must have active Top-Secret clearance with SCI or TS with the ability to acquire SCI.
• Experience in Splunk role while working in a Splunk Clustered Environment.
• Knowledge and experience with NESSUS, ACAS, and Trellix administration.
• Must be able to work a 40-hour work week normally Monday through Friday.
• Ability to work overtime during critical peaks and be available to meet last-minute requests for overtime if needed.
• Ability to travel 5-10%, primarily within 75 miles.
• Familiarity with MS Office applications such as Excel, Word, Outlook, SharePoint, Project, and Visio.
• Exceptional attention to detail, excellent verbal and written communication skills, strong critical thinking, organizational, time-management, and problem-solving skills.
• Ability to work both independently and as part of a team in a dynamic environment.

Clearance Required

• Must have active Top-Secret clearance with SCI or TS with the ability to acquire SCI.

Minimum Education

• Bachelors Degree in a related field (Cyber and/or Engineering).

Minimum Years of Experience

• 8 years of relevant experience.

Required Certifications

• Must possess or be able to obtain one of the following 8140 IAT Level II or III baseline certifications before a start date:
• Level II certifications include: CCNA Security, GISCP, GSEC, Security CE, SSCP.
• Level III certifications include: CASP, CE, CCNP Security, CISA, CISSP, or Associate GCE, GCIH.

Preferred Qualifications

• Ability to work within VMWare VCenter and Nutanix, building Red Hat systems.
• Configure, operate, and maintain ForeScout, Tripwire, and Ivanti tool suites.
• Possess understanding and experience with common cybersecurity toolsets and processes to include STIGS, IAVA, Management and Implementation, and OPORD/FRAGO support.
• Demonstrated experience in analysis, simulation environment configuration, troubleshooting, software/hardware enhancements, application deployments, and infrastructure upgrades in a dynamic information system hosting environment.
• Proficiency with Red Hat Linux.
• Managing Red Hat Satellite, Ansible.
• At least one of the following certifications is preferred:
• Splunk Core Certified Advanced Power User
• Splunk Enterprise Certified Administrator
• Splunk Enterprise Certified Architect
• Splunk Core Certified Consultant

Compensation Details

• 160,000 - 175,000 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.

• javelin Compensation Details: 175,000 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 401k 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-OHara Service Contract Act (SCA), or other employment contracts may include different provisions/benefits.

Original Posting 03/19/2026 - 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.

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