Network Administrator

General Information

Requisition # R63554 Locations USA-VA-Chantilly Posting Date 09/30/2025 Security Clearance Required TS/SCI 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 seeks a motivated, career and customer-oriented Network Administrator to join our team in Chantilly, VA.  This is an onsite position.

The candidate will be part of a Network Engineering team for our federal customer and will provide Network administration for a large Cisco enterprise environment, which consists of classified, and top-secret networks. The team ensures the availability of a reliable/robust network transport infrastructure that provides data protection for information delivered across strategic, operational and tactical boundaries.
 

Responsibilities

• Configures, Installs, supports and/or maintains LANs and/or WANs; evaluates and recommends networking product and software upgrades and also Configuring CISCO NXOS/IOS at both switch and router.
• Performs technical analyses of software, hardware and transmission facilities using various diagnostic tools in support of efficient network operations.
• Monitors data traffic and controls network resource performance to ensure high-quality transmission.
• Identifies, diagnoses, and resolves technical problems related to network failure/integrity. 
• Proactive monitoring and reporting of all network devices, services, overall health of the network using a combination of tools to ensure high availability and SLA’s.
• Assist the Help Desk in network troubleshooting and act as the primary support for all network related issues.
• Strong desire to discover the root cause of complex problems and communicate them effectively across IT disciplines and Management.

Required Qualifications

• Bachelor’s Degree (1½ year experience is equivalent to 1 year of college)
• 3 or more years’ experience in Network Administration
• Strong knowledge of networking: TCP/IP, VLANS, Ethernet, switching, routing, and routing protocols (BGP/OSPF), 802.1Q, and DNS, SNMP, TACACS, Access Control list
• Knowledge of Type 1 encryptors, TACLANES used to provide isolation and added security for the network transport and enterprise services.
• Experience working directly with Government customer • Technical writing and documentation/diagram skills (MS Visio/MS Word/MS Excel)
• Performs rack-mounting and de-installing communications equipment and associated cabling.

Preferred Qualifications:

• Network +
• CCNA
• Security +

Required Clearance:

• Must hold an active Top-Secret/SCI Clearance to be considered and be willing/able to obtain a CI Poly.

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.