Network Administrator

Original Posting:
August 3, 2026

For U.S. Positions:
While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $73,450.00 - $

The Defense Sector at Leidos isseeking a motivated TS/SCI cleared 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 candidatedemonstratesa solid foundation in networking fundamentals, a willingness to learn vendor-specific technologies, and the discipline tooperatewithin DoDnetwork standards.

• Assistin 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; elevate anomalies andassistin root cause analysis.
• Support configuration and maintenance offirewallrules, 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 devicesin accordance with change management procedures.
• Maintainaccurateand 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 andassistwith troubleshooting during network outages or degraded service events.

• Bachelor's degree with 4+ years of experience or a Master's degree with 2+ 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+ CErequiredat 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, andtrunking.
• Strong analytical and troubleshooting mindset, clear written and verbal communication, and the ability to work effectively in a team environment under supervision.

• 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-basedfirewallpolicies,…