Senior Manager, Classified Networks Administration

About the Role

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus and technical excellence are decisive advantages—and we are building a team that can deliver real capability, not just concepts. This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact.

Responsibilities

• Define and execute enterprise classified network strategy across multiple sites, labs, and manufacturing facilities.
• Design, implement, and operate infrastructure supporting Secret, Top Secret, SCI, and SAP environments.
• Oversee networking, compute, virtualization, storage, identity management, monitoring, and disaster recovery.
• Ensure compliance with RMF, NIST 800-53, ICD 503, DISA STIGs, and Zero Trust principles; support ATOs and government accreditation activities.
• Drive infrastructure modernization through automation, Infrastructure as Code, and DevSecOps practices.
• Partner with engineering, program management, and executive leadership to align technology delivery with business growth.
• Manage infrastructure budgets, vendor relationships, and multi-year technology roadmaps.
• Recruit, develop, and retain high-performing technical talent across multiple locations.
• Support new facility stand-ups, classified program starts, and proposal activities.

Requirements

• Bachelor's degree in Computer Science, IT, Engineering, or related field.
• 10+ years designing and operating enterprise infrastructure in classified environments.
• 5+ years leading technical teams across multiple sites.
• Experience in a defense contractor or government environment.
• Strong working knowledge of NIST SP 800-53, RMF, DoD cybersecurity policy, Windows Server/AD, Linux, VMware, Cisco networking, and enterprise storage.
• Demonstrated success building and scaling IT organizations in high-growth settings.
• Active Top Secret clearance; SCI eligibility required (CI Poly preferred).
• U.S. citizenship required.
• Ability to put in extended hours, including evenings and weekends, when required to meet aggressive timelines.
• This role is based in Torrance, CA and requires full-time onsite presence.

Preferred Qualifications

• SAP and SCI environment experience.
• SCIF or classified facility stand-up experience.
• Automation proficiency: PowerShell, Python, Terraform, or Ansible.
• Familiarity with Azure Government, AWS GovCloud, or hybrid classified cloud environments.
• Certifications: CISSP, CCNP/CCIE, VMware VCP, Azure Administrator, or equivalent.

What You'll Accomplish in Year One

• Establish scalable classified network infrastructure supporting multiple DoD programs.
• Achieve or maintain ATOs for critical classified systems.
• Build and develop a high-performing classified IT team.
• Develop repeatable operational processes that support rapid company growth.

Benefits

• Meaningful long-term equity, sharing in the company's significant growth trajectory.
• Four (4) weeks of paid time off and ten (10) company-paid holidays.
• Comprehensive health benefits, including 100% employee-covered medical and strong dependent coverage, dental, and vision plans.
• Paid parental leave to support growing families.
• $100 monthly fitness stipend to promote health and performance.
• Onsite EV charging for convenience.
• Catered meals, company-covered food during high-demand periods, and a fully stocked kitchen.

While this position does not currently require a U.S. government-issued security clearance, it may in the near future. Therefore, the ability to obtain and maintain a U.S. government–issued security clearance is required.