Senior Information System Security Engineer

Senior Information System Security Engineer Input Technology Solutions
-Warrenton, VA, United States

We are seeking a Senior Information System Security Engineer (ISSE) to serve as a subject matter expert in the design, implementation, and optimization of enterprise security toolsets. The successful candidate will lead the engineering efforts for the Trellix (ePO) ecosystem and the ACAS (Nessus) suite, ensuring mission‑critical assets remain secure, compliant, and resilient. This role requires a blend of high‑level security architecture, hands‑on troubleshooting, and the ability to drive secure‑by‑design principles across the System Development Life Cycle (SDLC).

The duties and responsibilities of the Senior ISSE include, but are not limited to, the following:

Core Responsibilities

Endpoint Security Engineering (Trellix/ePO)

• Ecosystem Management: Expertly design, configure, and maintain Trellix components (ePO, Trellix Agent, DLP, HIPS, Policy Auditor, ABM, and VSE) across Windows and Linux environments.
• Policy Development: Author and deploy endpoint security policies for ENS modules (Threat Prevention, Firewall, Web Control) based on DISA STIGs and organizational needs.
• Threat Mitigation: Develop custom signatures, rules, and exceptions to address zero‑day threats and specific operational requirements.
• Operational Continuity: Validate custom exceptions to ensure uninterrupted operation of mission‑critical processes without compromising compliance.

Vulnerability Management (ACAS/Nessus)

• Architecture & Strategy: Design enterprise‑wide vulnerability scanning strategies and manage the deployment of Security Centers and Nessus scanners.
• Advanced Troubleshooting: Serve as the final escalation point for complex scan issues, credentialing problems, and system communication failures.
• Risk Reporting: Configure automated reporting of compliance data to continuous monitoring systems and risk‑scoring repositories.

Security Integration & Engineering

• Tool Orchestration: Integrate Trellix and ACAS with tools such as Splunk, XSOAR, and Service Now to automate workflows and enhance incident response.
• RMF Support: Provide authoritative recommendations and ACAS‑generated artifacts to support the Assessment and Authorization (A&A) process and RMF packages for Authority to Operate (ATO).
• Strategic Oversight: Lead the maintenance and scalability of test, development, and operational environments, collaborating with Network and Dev Sec Ops  teams to enhance resilience.
• Multi‑Tier Support: Deliver Tier 1–3 maintenance and incident response for the full cybersecurity portfolio (ACAS, Trellix, Splunk, XSOAR).
• Compliance Mastery: Deep understanding of DISA STIGs, NIST 800‑53, and the Risk Management Framework (RMF).

Candidate Requirements

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

Minimum Years of

Experience:

• 8 years of relevant experience?

Required

Certifications:

• Ability to meet or exceed DODD 8140/8570 IAT Level 2 Requirements, to include CE certification

Nice to Have (Preferred Skills)

• RHEL Administration: Proficient understanding of Red Hat Enterprise Linux (RHEL) 8 and 9, including the ability to monitor and maintain cybersecurity tools at the OS level.
• SOAR Automation: Experience managing the full lifecycle of XSOAR infrastructure, including building complex playbooks, custom scripts, and integrations to automate cyber workflows.
• Splunk O&M: Proficiency in Splunk Operations & Maintenance, including managing distributed components, index management, version upgrades, and creating custom dashboards via the Monitoring Console.

Posted: Thursday, January 15, 2026

Job # 7535