Senior Network Engineer

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.

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.

Responsibilities:

• 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), and 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.

Requirements:

• Bachelor’s degree in computer science, information technology, engineering, or a related discipline with 8+ years of relevant experience.
• 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.

Preferred Qualifications:

• 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.

Salary: $92,300.00 - $166,850.00