IT Network Engineer Allen, TX IT

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

We are seeking a highly skilled
Network Engineer
to implement, manage, and maintain network infrastructures supporting our mission-critical systems. The ideal candidate will bring deep technical knowledge of networking protocols and architecture, an understanding of cybersecurity requirements (e.g., DISA STIGs, hardening, zero trust), and proven experience operating in a fast paced, growing organization. This role will align well with a candidate experienced working in a manufacturing campus setting. An independent, autonomous self-starter personality is a must.

• Design, deploy, and maintain secure and scalable enterprise network infrastructures, including LAN, WAN, VPN, VoIP, and wireless.
• Collaborate with network team lead, management, cybersecurity, and systems administration teams teams to enable and secure the corporate, OT, guest, and other networks
• Maintain modern hybrid cloud network infrastructure, including workloads on-premises, in major cloud providers, and in the field.
• Configure and manage routers, switches, firewalls, and other network devices from common major vendors.
• Implement and maintain system hardening in compliance with DoD STIGs, NIST frameworks, CMMC, and more.
• Perform troubleshooting and root cause analysis of complex network issues in a multitude of environments.
• Develop and maintain network documentation, diagrams, and standard operating procedures.
• Participate in audits, accreditation, and certification processes.
• Support deployments and field operations, including as-needed travel (5-10%) to other Castelion sites.

• Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience).
• 3+ years
  of experience in network engineering roles, 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 hardware: firewalls, switches, wireless access points, and power.
• 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).

• Industry certifications such as
  CompTIA Security+,CISSP,or
  CCNA.
• Experience with 802.1x and RADIUS for wired and wireless networks.
• Experience supporting classified networks.
• Experience with automation tools (Ansible, Terraform, Puppet, Power Shell DSC).
• Understanding of Zero Trust architecture and secure enclave designs.
• Active Security Clearance

• On-site work; some after-hours/on-call support may be necessary.
• Occasional lifting of IT equipment (up to 40 lbs) and data center work.

• Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

This position may require access to classified information or…