Cybersecurity Engineer Sr Principal

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 / -M compliant

GDIT IS YOUR PLACE

• 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.