Senior Network Administrator

The Defense Sector at Leidos is seeking a motivated TS/SCI cleared Senior Network Administrator to support the installation, configuration, and day-to-day management of enterprise network infrastructure. This role is an excellent opportunity for an early-career network professional to gain hands-on experience with routing and switching platforms, including Session Smart Router (SSR) / 128 Technology SD-WAN solutions, in a structured and security-conscious environment. The ideal candidate demonstrates a solid foundation in networking fundamentals, a willingness to learn vendor-specific technologies, and the discipline to operate within DoD network standards. 

The job duties will be performed daily on site at Langley Air Force Base, VA.

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Roles and Responsibilities:

• ​Assist in the configuration, deployment, and ongoing management of routers, switches, and Session Smart Router (SSR) appliances across enterprise and edge network environments. 

• ​Support the design and implementation of routing policies, service policies, and traffic steering configurations on SSR/128 Technology platforms under senior engineer guidance. 

• ​Perform LAN switching administration — including VLAN configuration, spanning tree, trunking, and port security — on Juniper EX Series and/or Cisco Catalyst platforms. 

• ​Assist with the configuration and troubleshooting of routing protocols including OSPF and BGP (eBGP and iBGP) across enterprise WAN and data center environments. 

• ​Monitor network health, availability, latency, and throughput using network management tools; escalate anomalies and assist in root cause analysis. 

• ​Support configuration and maintenance of firewall rules, access control lists (ACLs), IPsec VPN tunnels, and other network security controls. 

• ​Execute software and firmware upgrades, patch management, and lifecycle maintenance activities for network devices in accordance with change management procedures. 

• ​Maintain accurate and up-to-date network diagrams, device inventories, and standard operating procedures (SOPs). 

• ​Coordinate with senior network engineers, system administrators, and security personnel to resolve network incidents and support planned infrastructure changes. 

• ​Participate in on-call rotation and assist with troubleshooting during network outages or degraded service events. 

Basic Qualifications:

• Bachelor's degree with 8+ years of experience or a Master’s degree with 6+ years of experience. Additional years of experience may be considered in lieu of degree.

• ​Must have active and current DoD TS/SCI Clearance. 

• ​DoD 8570/8140-compliant certification at IAT Level II - CompTIA Security+ CE required at minimum. 

• Demonstrated understanding of OSI model, TCP/IP, subnetting, VLANs, routing protocols (BGP, OSPF, static routing), and WAN technologies. 

• Practical experience with LAN switching concepts on Juniper EX Series or Cisco Catalyst platforms, including VLANs, STP, and trunking. 

• Strong analytical and troubleshooting mindset, clear written and verbal communication, and the ability to work effectively in a team environment under supervision. 

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Preferred Qualifications:

• ​Juniper Networks Certified Associate (JNCIA-Junos) or progress toward JNCIS-ENT; Juniper SSR-specific training or certification a strong plus or Cisco CCNA.

• Familiarity with Border Gateway Protocol — including eBGP and iBGP concepts, peer configuration, route policies, and basic troubleshooting in a multi-site or service provider-adjacent environment. 

• Exposure to Juniper Session Smart Router (formerly 128 Technology) platforms, including familiarity with session-based routing, service and tenant models, or WAN traffic steering concepts. 

• Hands-on experience with advanced switching features such as RSTP/MSTP, LACP/LAG, Q-in-Q, or Layer 3 switching on either Juniper EX Series or Cisco Catalyst hardware. 

• Working knowledge of IPsec VPN configuration, zone-based firewall policies, or experience with Juniper SRX Series security platforms. 

• Basic familiarity with network automation tools or scripting (Python, Ansible, or Junos) for configuration management or compliance checks. 

• CompTIA Network+, or other vendor-neutral networking credentials demonstrating a broad networking foundation. 

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