Principal Cyber Security Engineer

General information

Requisition #

R71941

Locations

USA-VA-Chantilly

Posting Date

11/09/2026

Security Clearance Required

TS/SCI w/ Poly

Remote Type

Onsite

Time Type

Full time

Description & Requirements

Unlock the secrets of intelligence with MANTECH! Join a dynamic team at the forefront of national security, providing advanced solutions to government intelligence agencies. Since 1968, we've been solving the toughest challenges with groundbreaking tech. Explore thrilling projects in Digital Transformation, Cybersecurity, IT, Data Analytics and Software Development. Elevate your career and make a difference. Your adventure begins now-unleash your potential with MANTECH!

MANTECH seeks a motivated, career and customer-oriented Principal Cyber Security Engineer to join our team in Chantilly, VA.

In this role, you will support mission-critical cybersecurity operations by designing, deploying, and maintaining secure, resilient data collection and monitoring solutions that enable informed decision-making across the enterprise.

Responsibilities include but are not limited to:

• Troubleshoot new and existing data collection issues to ensure accurate and reliable ingestion of security-relevant data.
• Diagnose and resolve system issues that impact stability, performance, or usability.
• Deploy, manage, and maintain supported and unsupported Splunk Add-ons required for specific data sources.
• Develop and maintain documentation, including Body of Evidence (BOE) artifacts, engineering documentation, change management records, system security plans, and accreditation materials.
• Deliver comprehensive Splunk deployment documentation detailing specifications, deployment methods, and architectural considerations for production environments.
• Implement and maintain strict role-based access control to ensure data is accessible on a validated need-to-know basis.
• Design and deploy Splunk forwarders using centralized configuration management through the Splunk Deployment Server to support rapid and consistent deployments.

Minimum Qualifications:

• Bachelor's degree, or 4+ additional years of cybersecurity experience in lieu of a degree.
• 7+ years of experience in a cybersecurity role.
• Experience with Security Information and Event Management (SIEM) platforms and Splunk enterprise environments.
• Knowledge of Linux systems administration, general operating system security practices, TCP/IP networking, and network security concepts.
• Knowledge of Certification and Accreditation (C&A) processes and DoD technical security guidance for information systems.
• DoD Directive 8570.1 IAT Level II or higher certification, or the ability to obtain within 30 days of hire.

Preferred Qualifications:

• Splunk certification (e.g., Splunk Certified Administrator, Architect, or Power User).
• Hands-on experience with Linux distributions, including Red Hat and CentOS, and cloud environments such as AWS.
• Knowledge of ICS 500-27 audit collection requirements and feed creation to ingest customer logs in standardized formats.
• Familiarity with Enterprise Security Services, Host Based Security Services (HBSS), Enterprise Vulnerability Scanning Services, and User Activity Monitoring (UAM).

Clearance Requirements:

• An active TS/SCI with Polygraph is required.

Physical Requirements:

• Must be able to remain in a stationary position 50% of the time.
• Needs to occasionally move about inside the office to access file cabinets, office machinery, etc.
• Frequently communicates with co-workers, management, and customers, which may involve delivering presentations. Must be able to exchange accurate information in these situations.

The projected compensation range for this position is $141,500.00-$236,000.00. There are differentiating factors that can impact a final salary/hourly rate, including, but not limited to, Contract Wage Determination, relevant work experience, skills and competencies that align to the specified role, geographic location (For Remote Opportunities), education and certifications as well as Federal Government Contract Labor categories. In addition, MANTECH invests in its employees beyond just compensation. MANTECH's benefits offerings include, dependent upon position, Health Insurance, Life Insurance, Paid Time Off, Holiday Pay, short-term and long-term Disability, Retirement and Savings, Learning and Development opportunities, wellness programs as well as other optional benefit elections.

MANTECH considers all qualified applicants for employment without regard to disability or veteran status or any other status protected under any federal, state, or local law or regulation.

If you need a reasonable accommodation to apply for a position with MANTECH, please email us at careers@mantech.com and provide your name and contact information.