Senior Network Security Engineer

Leidos

Sr. Network Security Engineer responsible for maintaining secure network solutions for the Army.

Posted 6/19/2026full-timeRemote • 🇺🇸 United StatesSenior💰 $92,300 - $166,850 per yearWebsite

Tech Stack

Tools & technologies

Cyber SecurityFirewalls

About the role

Key responsibilities & impact

Operate and maintain secure network solutions operated as a centralized enterprise capability for the United States Army
Partner with key stakeholders and technical experts to perform legacy environment discovery, assessing current capabilities, configurations, and requirements to provide network firewall migration support for the Army global network
Analyze and understand complex firewall security zones and policies with the ability to transform policies between multiple vendor firewall devices while meeting mission requirements
Support secure access solutions leveraging zero trust network access (ZTNA) including support for creation of new access policies and maintenance of existing policies
Integrate capacity planning and scaling of network and security stack environments into the overall operational support processes and staff
Collect, investigate, and identify network resource management strategies and techniques to meet capacity and performance requirements
Work with information assurance teams and the AGUN cybersecurity service provider (CSSP) to ensure compliance to DoD standards to assist with maintenance of the network security posture
Document designs, diagrams, drawings, and technical narratives using wiki technologies and common diagram and drawing tools

Requirements

What you’ll need

Must currently possess and be able to maintain an active DoD SECRET security clearance
Minimum of a Bachelor’s degree with 10+ years' experience or Master's degree with 10+ years of experience (additional years of directly applicable experience may be accepted in lieu of a degree)
Require active DoD IAT Level II (i.e. Security+) certification or equivalent prior to start
Must obtain and maintain an approved Computing Environment (CE) certification applicable to the supported technology environment within six (6) months of hire
Expert understanding of networking and virtualization of firewalls including VSYS in a multi-tenant environment
Demonstrated experience with networking concepts such as LAN, WAN, BGP, TCP/UDP, IPSec, VPN, Routing(L2/L3), and firewalls in a virtualized environment
Demonstrate experience in one or more of the following enterprise network management tools such as Palo Alto Panorama, Cisco Prime, Cisco DNA, or Junos Space
Demonstrate experience in system hardening of network infrastructure to include DoD STIG implementation
Must have experience in working with two or more of the following vender network technologies: Cisco, Juniper, Palo Alto, Dell, RAVPN, Global Protect, or AppGate
Experience with the following protocols: SFTP, SSH, SCP, MPLS, SNMP, NTP
Must be able to work as part of a team to execute troubleshooting and resolve complex network security issues
Must have excellent written and verbal communication skills
Must be willing to work non-standard shifts to accomplish network migration objectives and goals
Must be able to interface with customers
Must be willing to travel up to 10% of the time

Benefits

Comp & perks

Health and Wellness programs
Income Protection
Paid Leave
Retirement

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

network securityfirewall migrationzero trust network access (ZTNA)network resource managementnetworking conceptssystem hardeningvirtualization of firewallsnetwork protocolsenterprise network managementcapacity planning

Soft Skills

team collaborationtroubleshootingcommunicationcustomer interfaceproblem-solving

Certifications

DoD SECRET security clearanceDoD IAT Level II (Security+)Computing Environment (CE) certification