Castelion
IT Network Engineer
Allen, TX +1 · Full-time · Posted Oct 19, 2026
- Location
- Allen, TX
716 South Greenville, Suite 160, Allen, TX 75002 - Experience
- 3+ years in network engineering roles; preferably in fast-paced companies, startups, defense, or government environments.
- Education
- Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience).
- Visa sponsorship
- If classified access requirements apply, employment may depend on obtaining and maintaining required U.S. Government security clearance or authorization and meeting applicable citizenship or other eligibility requirements. Employment is also contingent on being able to access applicable export-controlled information without additional export licensing.
About the job
Designs, deploys, and maintains secure enterprise networks supporting corporate, operational technology, cloud, and field environments.
What you'll do
- Build and maintain LAN, WAN, VPN, VoIP, wireless, and hybrid-cloud network infrastructure; configure network devices.
- Apply cybersecurity controls and hardening, troubleshoot complex network issues, and support audits and accreditation.
- Maintain network documentation and support deployments and field operations, including 5–10% travel to other sites.
What they ask for
- Bachelor’s degree in Computer Science, Information Technology, or a related field, or equivalent experience.
- Strong knowledge of TCP/IP, BGP, OSPF, EIGRP, and MPLS; hands-on experience with firewalls, switches, wireless access points, and power.
- Experience applying RMF, STIG, NIST, or CMMC controls; strong SD-WAN and SDN experience.
- Strong documentation and communication skills.
Nice to have
- Certifications such as CompTIA Security+, CISSP, or CCNA; experience with 802.1x and RADIUS or classified networks.
- Automation tools such as Ansible, Terraform, Puppet, or PowerShell DSC; knowledge of Zero Trust and secure enclave designs.
Tools
TCP/IP, BGP, OSPF, EIGRP, MPLS, SD-WAN, Ansible, Terraform
Model-written summary · the original posting is authoritative