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# Cybersecurity Engineer Sr Principal

- **Company:** General Dynamics Information Technology
- **Location:** McLean, VA, United States
- **Experience:** Expert
- **Salary:** $170,000.0 - $230,000.0
- **Contract:** Permanent contract
- **Skills:** Active Directory, Cyber Security, Linux, Linux Distribution, Red Hat Enterprise Linux, Security Information and Event Management, Software Vulnerability Management, Splunk, Plan of Action and Milestones, Vulnerability Analysis
- **Published:** October 26, 2026
- **Apply:** https://www.techcareers.com/job.asp?id=3467380657&tx=FR6764FFI&pt=1&aff=0B19D771-A501-4A5E-8338-2A822B784D54&utm_source=Job%20Feed&utm_medium=textkernel&utm_campaign=DE&utm_term=0B19D771-A501-4A5E-8338-2A822B784D54

## About the Role

Active Directory (AD),Redhat Linux Server,Splunk Administration,Tenable Security Center

Experience:

10 + years of related experience, Bring your cyber expertise and drive for innovation to GDIT. The Cybersecurity Engineer Sr Principal must have:

? Education: Bachelor of Arts/Bachelor of Science

? Experience: 10+ years of related experience

? Technical skills:

 * Hands-on experience with Red Hat operating system and other Linux distributions
 * Hands-on engineering experience administering and maintaining security operations using Splunk (SIEM), Tenable (vulnerability management), and Trellix (endpoint security)
 * Hands-on experience with Teramind for insider threat monitoring
 * Understanding of Microsoft Active Directory and implementing controls via Group Policy
 * Knowledge of the complete NIST SP 800 series (especially 800-37, 800-53, 800-30) and risk management principles

? Security clearance level: Active Top Secret

## Description

Advance your career while impacting our national security in cyber as a Cybersecurity Engineer Sr Principal at GDIT. Here, technologists have many paths to grow a meaningful career supporting cyber missions and operations across the federal government., As a Cybersecurity Engineer Sr Principal, the work you'll do at GDIT will be impactful to the mission of our customer's classified commercial cloud environment. You will play a crucial role in engineering and operating security controls for a classified secure workstation enclave, ensuring continuous monitoring, and compliance for mission-critical systems.

 * Support and lead configuration, hardening, and updates of Linux operating systems, directly contributing to the secure operation of the enclave.
 * Collaborate with enclave engineers, system administrators, and vendors to administer and maintain core security applications (SIEM, vulnerability scanning, endpoint protection, insider threat tooling) that safeguard the environment.
 * Drive continuous monitoring and incident response activities by validating telemetry, triaging alerts, investigating incidents, and supporting RMF-aligned vulnerability management, endpoint security, and auditing.
 * Utilize Red Hat/Linux, Splunk, Tenable, Trellix, Teramind, and Microsoft Active Directory/Group Policy to implement and validate security controls, maintain visibility, and provide actionable insights into the enclave's security posture.
 * Configure, harden, and update Linux operating systems within the secure enclave.
 * Administer and monitor core security tools (Splunk SIEM, Tenable, Trellix, Teramind), ensuring telemetry, policies, and integrations function as intended.
 * Triage and investigate security alerts and incidents in alignment with the Incident Response Plan.
 * Oversee vulnerability and STIG scanning (host inventory, scan policies, and results) and coordinate remediation with the engineering team.
 * Ensure complete endpoint visibility and policy enforcement across hosts and insider threat tooling.
 * Support RMF Continuous Monitoring activities, including vulnerability management, endpoint security, auditing, and security alert monitoring.
 * Contribute to security documentation, control implementation statements, assessment artifacts, and POA&M mitigation activities.