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Information System Security Engineer - Senior

Amentum

Company : Amentum

Location : San Antonio, TX

Posted Date : 13 October 2025

Job Type : Other

Category : Industrial Engineering

Occupation : Security Engineer

Job Details

Information System Security Engineer - Senior

Are you interested in using your skills to help shape the Cyber, Security, & Intel space? If so, look no further. Amentum is seeking an Information System Security Engineer - Senior to join our team of passionate individuals in San Antonio, TX. In this role you will support challenging, mission-critical projects that make a direct impact on the Nation's security and intelligence mission.

The duties and responsibilities of the Information System Security Engineer - Senior 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 the 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, and 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.

Requirements:

  • 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:

  • Bachelor's Degree in a related field (Cyber and/or Engineering)

Minimum Years of Experience:

  • 10 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 certs include - CCNA Security, GISCP, GSEC, Security+ CE, SSCP
    • Level III certs include - CASP CE, CCNP Security, CISA, CISSP (or Associate), GCED, GCIH

Preferred:

  • 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

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