Senior Network Engineer — Top Secret Clearance

i3, LLC; Chantilly (VA); On-site; USD 120,000 - 160,000; Full time

Job summary

i3, LLC is seeking a Senior Network Engineer to lead design, implementation, and optimization of resilient network infrastructures supporting mission-critical operations. The role requires strategic and technical leadership in modernization, security architecture, and performance optimization across complex, multi-enclave environments.

The candidate will oversee secure communications and network security standards, driving modernization aligned with zero-trust principles while collaborating with

Qualifications

• Extensive experience designing and supporting enterprise networks.
• Expertise in routing, switching, firewalls, VPNs, and network security.
• Experience implementing zero-trust architectures and secure communications in multi-enclave environments.

Responsibilities

• Design and implement enterprise network architectures for secure, mission-critical operations.
• Lead zero-trust network design initiatives and cross-enclave interoperability solutions.
• Optimize network performance, reliability, and security across complex, multi-enclave environments.
• Establish and enforce network security architecture standards and governance processes.
• Drive modernization efforts aligned with enterprise strategy and zero-trust principles.
• Ensure secure communications across classified and regulated environments.
• Provide technical leadership for network infrastructure planning and implementation.
• Partner with security, architecture, and operations teams to maintain resilient networks.

Skills

Cisco Switching

Cisco Routing

Cisco Firewalling

Site-to-Site VPNs

Arista Switching

VPN Tunnels

VMware ESXi

Proxmox

Nutanix Prism

NFS/Samba

QNAP Synology

Nessus

Splunk

Linux

IPA/FreeIPA

LDAP

Keycloak

Docker

Kubernetes

GitLab

Nginx

Jira

Confluence

Jupyter

Education

Bachelor's degree

Tools

VMware ESXi

Proxmox

Nutanix Prism

vCenter

VSAN

VxRail

Ceph

NFS

Samba

SSH

SFTP

Nessus

Splunk

Nginx

Confluence

Jira

Docker

Kubernetes

GitLab

Jupyter

Job description

i3, LLC is seeking a Senior Network Engineer to lead design, implementation, and optimization of resilient network infrastructures supporting mission-critical operations. The role requires strategic and technical leadership in modernization, security architecture, and performance optimization across complex, multi-enclave environments.

The candidate will oversee secure communications and network security standards, driving modernization aligned with zero-trust principles while collaborating with