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 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.
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 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.
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.
Original Posting:July 28, 2026For 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.
The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.
Skills Required
- Bachelor's degree in computer science, IT, engineering or related field, or equivalent experience (8+ years)
- Extensive experience designing, implementing, and supporting enterprise Cisco network infrastructure
- Hands-on experience configuring and administering Palo Alto Networks next-generation firewalls including security policies, NAT, threat prevention, and GlobalProtect
- Active DoD 8570/8140 IAT Level II certification (Security+, CySA+, or equivalent)
- Active Cisco Certified Network Associate (CCNA) certification
- Active Secret security clearance with ability to obtain and maintain Top Secret with SCI eligibility
- Strong working knowledge of TCP/IP, IPv4, IPv6, DDI (DNS/DHCP/IPAM), and NAT
- Proficiency with VLANs, Spanning Tree Protocol (STP), HSRP/VRRP, OSPF, and MPLS
- Experience supporting WAN connectivity (MPLS, VPN, Internet-based transport) and secure remote-access/site-to-site VPN technologies
- Knowledge of copper and fiber optic cabling standards and Quality of Service (QoS)
- Familiarity with Secure Access Service Edge (SASE) technologies
- Demonstrated experience troubleshooting enterprise LAN and WAN environments and performing advanced Layer 1-7 network diagnostics
- Experience supporting networking solutions within a Department of Defense enterprise
- Excellent written, verbal, and interpersonal communication skills
- Ability to manage multiple priorities independently and as part of a technical team
- Cisco Certified Network Professional (CCNP)
- Experience with BGP and advanced SD-WAN architectures (e.g., Versa Networks)
- Network automation experience using Python, Ansible, and Infrastructure-as-Code (IaC) technologies
- Familiarity with Network Access Control and Comply-to-Connect technologies such as Cisco ISE and IEEE 802.1X
- Experience with enterprise monitoring platforms such as SolarWinds or PRTG
- Experience supporting hybrid cloud networking in Microsoft Azure and/or AWS
- Knowledge of DoD RMF, STIGs, Zero Trust principles, and ZTNA
- Familiarity with break-and-inspect, reverse-web-proxy, packet capture review, and on-prem virtualization (vSphere)
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
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