Defense Network Engineer — DoD STIGs & Hybrid Cloud

Castelion Corporation; Allen (TX); On-site; USD 90,000 - 150,000; Full time

Job summary

Castelion Corporation seeks a highly skilled Network Engineer to design, deploy, and maintain secure enterprise networks across on-site facilities and field deployments. You will implement DoD-compliant hardening, manage LAN/WAN, VPNs, and SD-WAN, and collaborate with cybersecurity and IT teams in a fast-growing manufacturing campus environment.

The role requires 3+ years in network engineering, hands-on with routers, switches, firewalls, and wireless, plus RMF/NIST/CMMC knowledge.

Qualifications

• Bachelor’s degree or equivalent experience in Computer Science, Information Technology, or a related field.
• 3+ years of experience in network engineering, preferably in fast-paced companies, startup, defense, or government environments.
• Strong knowledge of networking protocols (TCP/IP, BGP, OSPF, EIGRP, MPLS).
• Hands-on experience with routers, switches, firewalls, wireless devices.
• Experience applying controls as directed by cybersecurity frameworks (RMF, STIGs, NIST, CMMC).
• Strong documentation and communication skills.
• Strong experience with SD-WAN and software-defined networking (SDN).

Responsibilities

• Design, deploy, and maintain secure and scalable enterprise network infrastructures (LAN/WAN/VPN/VoIP/Wi‑Fi).
• Collaborate with network team lead, management, cybersecurity, and systems administration teams to secure networks.
• Maintain hybrid cloud network infrastructure across on-premises, major cloud providers, and field deployments.
• Configure and manage routers, switches, firewalls, and other network devices from major vendors.
• Implement and maintain system hardening in compliance with DoD STIGs, NIST, CMMC, and related frameworks.
• Troubleshoot and perform root cause analysis of complex network issues across environments.
• Develop and maintain network documentation, diagrams, and SOPs.
• Participate in audits, accreditation, and certification processes.
• Support deployments and field operations with 5–10% travel to other Castelion sites.

Skills

Network engineering

TCP/IP

BGP

OSPF

EIGRP

MPLS

RMF/STIGs

NIST

CMMC

Documentation

SD-WAN

SDN

CompTIA Security+

CISSP

CCNA

Ansible

Terraform

Puppet

PowerShell DSC

Education

Bachelor’s degree in Computer Science / Information Technology or related field

Tools

Ansible

Terraform

Puppet

PowerShell DSC

Job description

Castelion Corporation seeks a highly skilled Network Engineer to design, deploy, and maintain secure enterprise networks across on-site facilities and field deployments. You will implement DoD-compliant hardening, manage LAN/WAN, VPNs, and SD-WAN, and collaborate with cybersecurity and IT teams in a fast-growing manufacturing campus environment.

The role requires 3+ years in network engineering, hands-on with routers, switches, firewalls, and wireless, plus RMF/NIST/CMMC knowledge.