Senior Network Engineer with Security Clearance

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- 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.

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.

Primary 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)

* 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 Global Protect 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.

Basic Qualifications:

* 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 Global Protect.
* 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…