Principal Cyber Security Engineer

General Information

Requisition # R64758 Locations USA-VA-Chantilly Posting Date 12/12/2025 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.

This role supports the Comply-to-Connect (C2C) mission by engineering and sustaining secure network infrastructures across classified and unclassified environments. You will work alongside cyber experts to develop solutions that enhance network compliance and security posture across DoD systems.
 

Responsibilities include but are not limited to:

• Engineer, design, implement, integrate, and sustain Comply-to-Connect (C2C) deployment support to migrate, deploy, improve, and maintain C2C services
• Manage and maintain appliances, applications, servers, and supporting infrastructure in both classified and unclassified environments
• Coordinate with the network service provider to develop and maintain network architecture diagrams
• Evaluate and recommend changes and/or technology upgrades to address performance, standardization, and industry best practices
• Monitor and investigate C2C performance and faults and recommend improvements
• Interact with other team members and customers at multiple levels to gather, supply, or coordinate information
• Support Assessment and Authorization activities related to cybersecurity technologies, where applicable 

Minimum Qualifications:

• Bachelor’s degree or 4+ years of additional cyber experience in lieu of degree
• 7+ years of cyber experience
• Experience with technologies involved in large-scale enterprise network deployments and data centers
• Experience deploying and/or supporting enterprise security software products such as firewalls, IPS, anti-virus solutions, application firewalls, high availability solutions, network management systems, and virtual systems
• Knowledge of Windows and Linux systems, general operating system security practices, TCP/IP networking, 802.1x, and network security concepts
• IAT Level II certification (GSEC, Security+, SSCP, or CCNA-Security) or ability to obtain within 6 months of hire 

Preferred Qualifications:

• Experience implementing and using complex software products involving multiple integrated components
• Real-time, enterprise-level C2C expertise including vendor-agnostic services, open-source trends, and proficiency in DoD integration, engineering, and sustainment processes
• Experience with Cisco Identity Services Engine (ISE)
• Experience with tools such as Nmap, Nessus, and tcpdump 

Clearance Requirements:

• Must have a current/active TS/SCI with CI Polygraph 

Physical Requirements:

• The person in this position must be able to remain in a stationary position 50% of the time
• Occasionally move 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.