Cybersecurity Engineer Sr Principal

Public Trust: None

Requisition Type: Regular

Your Impact

Own your opportunity to support our nation's defense. Make an impact by connecting and securing critical operations across the globe, keeping our country safe and secure.

Job Description

CYBERSECURITY ENGINEER SR PRINCIPAL

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.

MEANINGFUL WORK AND PERSONAL IMPACT

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.

WHAT YOU’LL NEED TO SUCCEED

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

● Role requirements:

• Onsite -McLean, VA
• Must be DoD 8140 / 8570.01-M compliant

GDIT IS YOUR PLACE

At GDIT, the mission is our purpose, and our people are at the center of everything we do.

● Growth: AI-powered career tool that identifies career steps and learning opportunities

● Support: An internal mobility team focused on helping you achieve your career goals

● Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off

● Flexibility: Full-flex work week to own your priorities at work and at home

● Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY

Explore a career in cyber at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your focus on defending and protecting what matters.

Work Requirements

Years of Experience

10 + years of related experience

* may vary based on technical training, certification(s), or degree

Certification

Travel Required

10-25%

Citizenship

U.S. Citizenship Required