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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Network Engineer - **Company:** Leidos, Inc. - **Location:** Fort Belvoir, VA, United States - **Experience:** Expert - **Salary:** $92,300.0 - $166,850.0 - **Contract:** Permanent contract - **Skills:** IEEE 802.1X, Access Network, Amazon Web Services, Proxy Servers, Microsoft Azure, Border Gateway Protocol, Spanning Tree Protocols, Cisco Routers, CompTIA Security+, Cyber Security, System Configuration, Dynamic Host Configuration Protocol, Network Address Translation, Domain Name System (DNS), Hot Standby Router Protocol, IPv4, IPv6, Intrusion Detection and Prevention, Virtual Private Networks (VPN), Multi-protocol Systems, Python (Programming Language), Local Area Networks, Network Security, Network Troubleshooting, MPLS VPN, Network Architecture, Networking Basics, Network Diagrams, Network Monitoring, Routing, Packet Analyzer, Open Shortest Path First (OSPF), Paessler Router Traffic Grapher, Remote Access Technology, Ansible, Zero Trust Network Access, TCP/IP, Virtual Local Area Networks, Virtual Router Redundancy Protocols, Virtualization Technology, VMware VSphere, Wide Area Networks, Network Routing, Diagnostic Tools, Computer Networking Systems, Identity Services Engine, Network Access Control, HybridCloud, Firewalls (Computer Science), SC Clearance, Information Technology, SDN Network, SolarWinds (Software), Palo Alto Networks, Open Network Automation Platform, Cisco - **Published:** October 20, 2026 - **Apply:** https://www.careercircle.com/jobs/all/all/usa/all/all/c5e6987c-6508-490e-a25a-ced8251b6819 ## About the Role Ansible On Prem Firewall Equities MPLS VPN Resilience SolarWinds Scalability Market Data IEEE 802.1X Proxy Servers Cyber Security Virtualization Access Network Microsoft Azure Network Routing Packet Analyzer Physical Layers Ancient History Computer Science Cisco Networking Network Security Secret Clearance Network Diagrams Security Policies Incident Response CompTIA Security+ Fiber Optic Cable Wide Area Networks Network Monitoring Network Automation Security Solutions Amazon Web Services Local Area Networks Network Engineering Top Secret Clearance Remote Access Systems Information Technology Network Infrastructure Network Access Control Hybrid Cloud Computing Cisco Routers Switches Network Troubleshooting Border Gateway Protocol Spanning Tree Protocols Cyber Security Policies Risk Management Framework Engineering Documentation IAT Level II Certification Hot Standby Router Protocol, Python (Programming Language) Multiprotocol Label Switching Virtual Private Networks (VPN) Open Shortest Path First (OSPF) Secure Remote Password Protocols Network Quality Of Service (QoS) Troubleshooting (Problem Solving) Virtual Local Area Network (VLAN) Cisco Certified Network Associate Cisco Identity Services Engine (ISE) Cisco Certified Network Professional CompTIA Cybersecurity Analyst (CySA+) Dynamic Host Configuration Protocol (DHCP) Software-Defined Networking Wide Area Network (SD-WAN) Top Secret-Sensitive Compartmented Information (TS/SCI Clearance) At least 8 years, The ideal candidate is an experienced network engineer with extensive knowledge of Cisco networking technologies, Palo Alto Networks security solutions, and enterprise routing and switching. This individual will work independently and collaboratively with multidisciplinary engineering teams to deliver secure, resilient, and scalable network solutions that support evolving customer mission requirements. Clearance: Active TS/SCI clearance at time of hire., * Bachelor's degree in computer science, information technology, engineering, or a related discipline with 8+ years of relevant experience. Additional years of experience may be substituted for a degree. * Active DoD 8570/8140 IAT Level II certification (Security+, CySA+, or equivalent). * Active Cisco Certified Network Associate (CCNA) certification. * Active TS/SCI clearance at time of hire. * Extensive experience designing, implementing, and supporting enterprise Cisco network infrastructure. * Strong working knowledge of: * TCP/IP * IPv4/IPv6 * DDI (DNS / DHCP / IPAM) * NAT * VLANs * Copper and fiber optic cabling standards * Quality of Service (QoS) * OSPF * MPLS * Secure Access Service Edge (SASE) technologies * Hands-on experience configuring and administering Palo Alto Networks next-generation firewalls, including security policies, NAT, threat prevention, and GlobalProtect. * Experience implementing and supporting secure remote-access and site-to-site VPN technologies. * Demonstrated experience troubleshooting enterprise LAN and WAN environments. * Experience supporting networking solutions within a fast-paced Department of Defense enterprise. * Excellent written, verbal, and interpersonal communication skills. * Ability to manage multiple priorities while working independently and as part of a technical team., * Cisco Certified Network Professional (CCNP) certification. * Experience with Border Gateway Protocol (BGP) and advanced Software-Defined WAN (SD-WAN) architectures. * Experience deploying and supporting Versa Networks or similar SD-WAN solutions. * Experience with network automation using Python, Ansible, and Infrastructure-as-Code (IAC) technologies. * Familiarity with Network Access Control and Comply-to-Connect technologies such as Cisco Identity Services Engine (ISE) and IEEE 802.1X authentication. * Experience with enterprise network monitoring platforms such as SolarWinds or PRTG. * Experience supporting hybrid cloud networking in Microsoft Azure and/or AWS environments. * Knowledge of DoD Risk Management Framework (RMF), Security Technical Implementation Guides (STIGs), and Zero Trust networking principles including SD-WAN, micro- and macro-segmentation, and Zero Trust Network Access (ZTNA). * Familiarity with break-and-inspect, reverse-web-proxy, and other application-based firewall features. * Experience reviewing packet capture data for troubleshooting and packet analysis. * Experience supporting on-prem virtualization platforms such as vSphere. If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares. ## Description Leidos is seeking a Senior Network Engineer to support the design, implementation, modernization, and sustainment of enterprise network infrastructure within a fast-paced Department of Defense (DoD) environment in Fort Belvoir, VA or Albuquerque, New Mexico. The successful candidate will provide engineering expertise for mission-critical Local Area Network (LAN), Wide Area Network (WAN), and secure network infrastructure supporting classified and enterprise operations., * Design, implement, configure, and maintain enterprise LAN and WAN infrastructure. * Engineer and support Cisco routing and switching environments for mission-critical networks. * Configure, troubleshoot, and optimize enterprise routing and switching technologies, including: * OSPF * BGP * VLANs * Spanning Tree Protocol (STP) * HSRP/VRRP * Support WAN connectivity utilizing MPLS, VPN, and Internet-based transport technologies. * Configure, administer, and maintain Palo Alto Networks next-generation firewalls. * Design, implement, and support secure Palo Alto GlobalProtect remote access and site-to-site VPN solutions. * Monitor network health, analyze performance, identify bottlenecks, and implement corrective actions. * Perform advanced Layer 1-7 network troubleshooting using industry-standard diagnostic tools. * Develop and maintain engineering documentation, implementation plans, network diagrams, and standard operating procedures. * Participate in technology refreshes, network modernization efforts, and infrastructure upgrades. * Collaborate with cybersecurity personnel to ensure compliance with DoD cybersecurity policies, RMF requirements, and applicable STIGs. * Support scheduled maintenance activities, incident response, and operational troubleshooting in a high-availability environment.