Cybersecurity Engineer Sr Principal

Type of Requisition: Regular Clearance Level Must Currently Possess: Top Secret/SCI Clearance Level Must Be Able to Obtain: Top Secret/SCI Public Trust/Other Required: None Job Family: Cyber and IT Risk Management Job Qualifications: Skills: Active Directory (AD), Redhat Linux Server, Splunk Administration, Tenable Security Center Certifications: None Experience: 10 + years of related experience US Citizenship Required: Yes 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. The likely salary range for this position is $164,382 - $210,450. This is not, however, a guarantee of compensation or salary. Rather, salary will be set based on experience, geographic location and possibly contractual requirements and could fall outside of this range. Scheduled Weekly Hours: 40 Travel Required: 10-25% T elecommuting Options: Onsite Work Location: USA VA McLean Additional Work Locations: Total Rewards at GDIT: Our benefits package for all US-based employees includes a variety of medical plan options, some with Health Savings Accounts, dental plan options, a vision plan, and a 401(k) plan offering the ability to contribute both pre and post-tax dollars up to the IRS annual limits and receive a company match. To encourage work/life balance, GDIT offers employees full flex work weeks where possible and a variety of paid time off plans, including vacation, sick and personal time, holidays, paid parental, military, bereavement and jury duty leave. To ensure our employees are able to protect their income, other offerings such as short and long-term disability benefits, life, accidental death and dismemberment, personal accident, critical illness and business travel and accident insurance are provided or available. We regularly review our Total Rewards package to ensure our offerings are competitive and reflect what our employees have told us they value most. Our Identity Verification Process: As part of the hiring process, we will ask you to complete an identity verification process that leverages advanced biometrics and artificial intelligence to ensure authenticity and protect against identity fraud. You are expected to be on camera during virtual interviews. We reserve the right to take your picture to verify your identity and prevent fraud. By proceeding, you authorize the collection, processing, and use of your biometric data for identity verification and security purposes. About Our Work: We are GDIT. A global technology and professional services company that delivers technology solutions and mission services to every major agency across the U.S. government, defense and intelligence community. Our 26,000 experts extract the power of technology to create immediate value and deliver solutions at the edge of innovation. We operate across 50+ countries worldwide, offering leading mission-ready capabilities in AI, cloud, cyber and software development. Join our Talent Community to stay up to date on our career opportunities and events at . Equal Opportunity Employer / Individuals with Disabilities / Protected Veterans