Principal Cyber Security Engineer

General information

Requisition # R65503 Locations USA-VA-Chantilly Posting Date 01/27/2026 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 and mission-driven Principal Cyber Security Engineer to join our team in Chantilly, VA.

You will help ensure the operational integrity and advancement of secure enterprise environments by supporting Cross Domain Solutions (CDS). This role supports high-impact cybersecurity missions through Tier 2/3 operations, system engineering, and security compliance.
 

Responsibilities include but are not limited to:

• Supporting operations and maintenance (Tier 2/3) of deployed Cross Domain Solutions (CDS) interface technologies
• Engineering and deploying capabilities to provide new functionality, improve system performance/availability, and generate efficiencies in maintaining the operational environment
• Supporting Assessment and Authorization (A&A) activities related to CDS technologies
• Identifying and resolving conflicts related to the implementation of CDS technologies within the enterprise
• Contributing to the successful completion of key project milestones
• Providing solutions to a variety of complex technical problems
• Developing plans to safeguard computer files against unauthorized modification, destruction, or disclosure
   

Minimum Qualifications:

• Bachelor’s degree or 4+ years of additional experience in lieu of a degree
• 7+ years of experience in cybersecurity
• Experience with Linux operating systems and scripting
• Knowledge of general operating system security practices, TCP/IP networking, and network security concepts
• Knowledge of cybersecurity architectural principles such as defense in depth, resilience, and integrated security operations
• IAT Level II certification or the ability to obtain within 6 months of hire
   

Preferred Qualifications:

• Experience creating custom Splunk dashboards
• Experience working in Agile environments
• Knowledge of CDS technologies on the NCDSMO approved products list
• Knowledge of database and operating system security
• Knowledge of defensive cyber operations
• Ability to apply security principles to systems and enterprise system designs
   

Clearance Requirements:

• Must possess an active TS/SCI with Polygraph
   

Physical Requirements:

• The person in this position must be able to remain in a stationary position 50% of the time.
• Occasionally moves about inside the office to access file cabinets, office machinery, or to communicate with co-workers, management, and customers via email, phone, and/or virtual communication, which may involve delivering presentations.

MANTECH International Corporation 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.