Senior Network Engineer – DoD & Zero Trust

L3Harris Technologies, Inc.; Dahlgren (VA); On-site; USD 89,000 - 165,000; Full time

Job summary

L3Harris Technologies is seeking a Network Engineering Specialist to design, implement, and troubleshoot enterprise networks at Dahlgren, VA. You will work on classified and unclassified environments, with emphasis on security, automation, and modernization efforts to support space domain awareness for DoD missions.

The role requires strong hands‑on experience with Juniper/Cisco devices, network automation, and DISA STIG compliance, and offers on‑site work with potential overtime and travel as

Qualifications

• Must have an active Top Secret Clearance with ability to obtain SCI access within 6 months of hire.
• Bachelor’s Degree in Network Engineering, Information Technology, Cybersecurity, or a related field and a minimum of 4 years of prior relevant experience; Or, Graduate Degree and a minimum of 2 years of prior related experience; Or, in lieu of a degree, a minimum of 8 years of prior related experience
• 6+ years of experience supporting enterprise network infrastructure in a DoD, federal, or similarly regulated environment
• Strong hands‑on experience configuring, maintaining, troubleshooting, and supporting lifecycle management for Juniper and Cisco network devices
• Experience applying and maintaining DISA STIG compliance across network devices
• Experience leading technical training, mentoring junior staff, or serving as a team SME
• Experience with network automation using scripting, templates, or similar tools
• Active Security+ CE Certification
• Experience with Arista and Dell network devices
• Experience with Apstra for multi-site provisioning and lifecycle management

Responsibilities

• Design, implement, maintain, and troubleshoot enterprise network infrastructure across classified and unclassified environments
• Administer and optimize network deployments
• Support routing and switching operations, including BGP, OSPF, VLANs, STP, and enterprise segmentation
• Perform advanced root cause analysis and resolution of complex network incidents affecting mission-critical operations
• Plan and execute network upgrades, patching, and lifecycle refresh efforts with minimal operational impact
• Develop and maintain network diagrams, SOPs, TTPs, implementation plans, and technical documentation
• Automate network configuration, compliance, and deployment tasks using scripting and templating tools
• Implement and maintain DISA STIG‑compliant network configurations across enterprise devices
• Support Zero Trust Architecture (ZTA) initiatives through posture assessment, profiling, policy enforcement, and access control
• Manage enterprise‑scale switch provisioning and configuration standardization efforts
• Monitor network health, availability, and performance using enterprise management tools
• Provide technical guidance and escalation support to junior engineers and technicians
• Coordinate with cybersecurity, systems, COMSEC, and external organizations to support network changes and vulnerability remediation
• Deliver technical briefings and status updates to leadership and stakeholders
• Support after‑hours maintenance windows and on‑call response for mission‑critical outages, as needed
• Up to 10% travel may be required

Skills

Top Secret Clearance

DoD/regulatory experience

Network troubleshooting

BGP/OSPF/VLANs

Automation scripting

DISA STIG compliance

Zero Trust Architecture

Network security

Mentoring

Zero-downtime upgrades

Education

Bachelor’s Degree in Network Engineering/related field

Graduate Degree (MS) in related field

Security+ CE Certification

Tools

Juniper/Cisco devices

Arista devices

Dell devices

SolarWinds

Apstra Data Center Director

Job description

L3Harris Technologies is seeking a Network Engineering Specialist to design, implement, and troubleshoot enterprise networks at Dahlgren, VA. You will work on classified and unclassified environments, with emphasis on security, automation, and modernization efforts to support space domain awareness for DoD missions.

The role requires strong hands‑on experience with Juniper/Cisco devices, network automation, and DISA STIG compliance, and offers on‑site work with potential overtime and travel as