Network Administrator

General Information

Requisition # R64043 Locations USA-VA-Chantilly Posting Date 10/30/2025 Security Clearance Required TS/SCI w/ Poly Remote Type Onsite Time Type Full time

Description & Requirements

Shape the future of defense with MANTECH! Join a team dedicated to safeguarding our nation through advanced tech and innovative solutions. Since 1968, we’ve been a trusted partner to the Department of Defense, delivering cutting-edge projects that make a real impact. Dive into exciting opportunities in Cybersecurity, IT, Data Analytics and more. Propel your career forward and be part of something extraordinary. Your journey starts now—protect and innovate with MANTECH!

MANTECH is seeking a motivated, career and customer-oriented Network Administrator to join our team in Chantilly, VA. This is a position requiring onsite work at customer locations within the local area (up to 10% travel). This is a mentored Network Administrator given guidance by a senior network engineer.

Responsibilities include but are not limited to:

• Designing and integrating comprehensive network, VoIP, VTC, and data center
• solutions, adhering to security guidelines and customer specifications to ensure
• robust and secure communication infrastructures.
• Managing the end-to-end integration of black and red networks, overseeing
• design, installation, maintenance, and coordination of a growing network with
• multiple external services to support operational needs.
• Diagnosing and resolving complex issues related to customer sites,
• telecommunications circuits, routing, switching, VoIP, VTC, network encryption
• devices, and Cisco data center/security to maintain network stability and
• performance.
• Developing and maintaining detailed documentation, diagrams, and standard
• operating procedures to facilitate knowledge sharing and efficient network
• management.
• Providing expert guidance, training, and support to network administrators,
• service desk personnel, and junior engineers to enhance team capabilities and
• operational effectiveness.

Minimum Qualifications:

• Bachelor’s degree in Computer Science, Network Engineering, or equivalent field, demonstrating a strong academic foundation in related disciplines (additional 1 years of experience may be substituted in lieu of degree)
• 0-3 years of related experience in networking. Knowledge of VoIP, VTC, data circuits, and network encryption devices (e.g., General Dynamics TACLANE).
• Experience with routing protocols such as OSPF and BGP, with an understanding of MPLS and DMVPN technology for efficient network routing.
• DoD 8140 IAT Level II certification: SecurityCE and Computing Environment (CE) certification in Cisco technology (CCNA Voice) required.
• Valid US Drivers License with the ability to travel up to 10% locally to customer sites.

Preferred Qualifications:

• Cisco Collaboration, Data Center, or Security certifications, indicating advanced expertise and specialized knowledge in relevant Cisco technologies.
• Experience implementing or troubleshooting VMware NSX-T virtualized networking and security platform developed by VMware. It enables automated implementation of network policies, network objects, isolation, and micro-segmentation.

Clearance Requirements:

• Must have a current/active TS/SCI with the ability to obtain a 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.