Senior Cyber Security Engineer

Cybersecurity Jobs; Chantilly (VA); On-site; USD 104,000 - 218,000; Full time

Job summary

CACI is seeking a Senior Cyber Security Engineer to support mission-critical enterprise cybersecurity applications and systems from Chantilly, VA on an onsite basis. You will help operate and improve vulnerability scanning capabilities, provide Tier 2/3 engineering support, and contribute to A&A activities in support of program requirements.

This role involves engineering support for cybersecurity tooling, troubleshooting scanning and integration issues, and identifying opportunities to automate

Qualifications

• Active TS/SCI clearance with polygraph.
• Bachelor’s degree or 4+ years of relevant experience.
• 5+ years of experience with cybersecurity tools in an enterprise environment.
• Hands-on experience with Tenable products and enterprise vulnerability scanning operations.
• Strong knowledge of Windows and Linux administration, OS hardening, TCP/IP networking, and core network security concepts.
• Expertise in enterprise scanning, continuous monitoring, host/network defense, and intrusion detection.
• Ability to translate cybersecurity needs into technical requirements and apply defense-in-depth principles.
• Excellent communication, organization, troubleshooting, and customer-support skills.
• Active IAT Level II certification, or ability to obtain within 30 days of hire.

Responsibilities

• Provide engineering support and system administration for cybersecurity applications including installation, configuration, maintenance, patching, and backup/restore.
• Develop, customize, and manage scan policies, audit files, scan jobs, dashboards, and reports (Nessus and ServiceNow integrations).
• Deliver Tier 2 and Tier 3 support for cybersecurity technologies while ensuring compliance with customer policies, procedures and TASKORDs.
• Troubleshoot vulnerability scanning issues and provide responsive support via phone, email, and messaging platforms.
• Identify opportunities for process automation and integrate scripted solutions to streamline tasks and support metrics.
• Support Assessment & Authorization (A&A) work by updating documentation, preparing security artifacts, and resolving conflicts.
• Review policies and workflows to improve efficiency and cybersecurity posture.

Skills

Cybersecurity tooling experience

Automation scripting

Vulnerability scanning operations

Incident response

Communication skills

Education

Bachelor’s degree

4+ years of relevant experience

Tools

Tenable Nessus

ServiceNow

AWS

Windows

Linux

NIST SP 800-37 RMF

NIST SP 800-137 Continuous Monitoring

Job description

CACI is seeking a Senior Cyber Security Engineer to support mission-critical enterprise cybersecurity applications and systems from Chantilly, VA on an onsite basis. In this role, you will help operate and improve vulnerability scanning capabilities, provide Tier 2/3 engineering support, and contribute to Assessment and Authorization (A&A) activities in support of program requirements.

This position involves engineering support for cybersecurity tooling, troubleshooting scanning and integration issues, and identifying opportunities to automate repetitive tasks and improve operational metrics. Work will also include analyzing policies, customer input, and workflows to recommend enhancements that strengthen efficiency and cybersecurity posture.

Responsibilities

• Provide engineering support and system administration for cybersecurity applications, including installation, configuration, maintenance, patching, and backup/restore.
• Develop, customize, and manage scan policies, audit files, scan jobs, dashboards, and reports, including content supporting Tenable Nessus and ServiceNow integrations.
• Deliver Tier 2 and Tier 3 support for cybersecurity technologies while ensuring compliance with customer policies, procedures, and TASKORDs.
• Troubleshoot vulnerability scanning issues and provide responsive support via phone, email, and messaging platforms.
• Identify opportunities for process automation and integrate scripted solutions to streamline repetitive tasks and support metrics collection.
• Support Assessment & Authorization (A&A) work by updating documentation, preparing security artifacts, and resolving technical conflicts.
• Review policies, customer feedback, and operational workflows to recommend enhancements that improve efficiency and cybersecurity posture.

Requirements

• Active TS/SCI clearance with polygraph.
• Bachelor’s degree or 4+ years of additional relevant experience.
• 5+ years of experience working with cybersecurity tools in an enterprise environment.
• Hands-on experience with Tenable products and enterprise vulnerability scanning operations.
• Strong knowledge of Windows and Linux administration, operating system hardening, TCP/IP networking, and core network security concepts.
• Demonstrated expertise in enterprise scanning, continuous monitoring, host/network defense, and intrusion detection.
• Ability to translate functional cybersecurity needs into technical requirements and apply architectural principles such as defense-in-depth and resilience.
• Excellent communication, organization, troubleshooting, and customer-support skills.
• Active IAT Level II certification, or the ability to obtain it within 30 days of hire.

Technologies

• Tenable Nessus
• ServiceNow
• AWS services
• Windows
• Linux
• NIST SP 800-37 (RMF)
• NIST SP 800-137 (Continuous Monitoring)

Travel

• Up to 10% travel
• Local travel

Additional Considerations

• Experience with AWS services and ServiceNow.
• Familiarity with federal cybersecurity frameworks such as NIST SP 800-37 (RMF) and NIST SP 800-137 (Continuous Monitoring).
• Experience developing automation and scripting solutions to support workflow optimization.
• Ability to operate effectively in a fast-paced environment while managing multiple priorities.
• Strong collaboration skills, with the ability to work independently or as part of a team.

Salary Range: USD 103,800 - 218,100 per year.

This position is contingent on funding and may not be filled immediately. However, it is representative of positions within CACI that are consistently available, and applicants may also be considered for other CACI roles.