Senior Cybersecurity Engineer (TS/SCI w/ Poly)

CACI International Inc; Chantilly (VA); On-site; USD 104,000 - 218,000; Full time

Job summary

CACI International Inc in Chantilly, VA seeks a Senior Cyber Security Engineer to protect mission‑critical environments. You will support cybersecurity applications, automate workflows, and strengthen system security across the enterprise.

Responsibilities include configuring and maintaining security tools, developing scan policies for Tenable Nessus with ServiceNow integration, and delivering Tier 2/3 support while contributing to A&A artifacts and incident response efforts.

Qualifications

• Active TS/SCI clearance with polygraph.
• Bachelor’s degree or 4+ years of additional relevant experience.
• 5+ years of experience with cybersecurity tools in an enterprise environment.
• Hands-on with Tenable products and enterprise vulnerability scanning.
• Strong Windows and Linux administration and network security knowledge.
• IAT Level II certification or ability to obtain within 30 days.

Responsibilities

• Provide engineering support and system administration for cybersecurity applications.
• Develop, customize, and manage scan policies, dashboards, and reports for Nessus and ServiceNow.
• Deliver Tier 2/3 support and ensure compliance with policies and TASKORDs.
• Troubleshoot vulnerability scanning issues via multiple channels.
• Support A&A activities by updating documentation and security artifacts.

Skills

TS/SCI with polygraph

Windows administration

Linux administration

TCP/IP networking

Defence-in-depth

Vulnerability scanning

Automation scripting

Communication skills

A&A documentation

Incident response

Team collaboration

Education

Bachelor’s degree or equivalent

Tools

Tenable Nessus

ServiceNow

Job description

CACI International Inc in Chantilly, VA seeks a Senior Cyber Security Engineer to protect mission‑critical environments. You will support cybersecurity applications, automate workflows, and strengthen system security across the enterprise.

Responsibilities include configuring and maintaining security tools, developing scan policies for Tenable Nessus with ServiceNow integration, and delivering Tier 2/3 support while contributing to A&A artifacts and incident response efforts.