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Senior Manager, Classified Networks Administration

Torrance, California, United States
Full Time On-site

Build, scale, and lead enterprise classified IT infrastructure across multiple secure facilities. Own strategy, architecture, deployment, and operations of classified network environments supporting mission-critical defense programs. Partner closely with Engineering, Cybersecurity, Facilities, Security, and Program Management to deliver compliant, resilient infrastructure in a fast-paced defense startup.

Key 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.

Required Qualifications

  • 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.

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.

Additional Requirements:

  • 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

Other Duties

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.

Benefits And Perks

All full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.

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. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.

Affirmative Action/EEO Statement

About Castelion

Castelion

Castelion is one of the fastest-rising defense technology companies focused on building affordable, rapidly deployable hypersonic strike systems for the U.S. military. Founded by former SpaceX leaders, the company is working to modernize how advanced weapons are developed and manufactured—using rapid iteration, vertical integration, and scalable production to deliver next-generation deterrence capabilities faster than traditional defense programs. Castelion’s mission centers on restoring America’s ability to field advanced military technology at speed and scale.

For job seekers, Castelion offers the opportunity to work directly on some of the most advanced technologies in national defense, including propulsion systems, avionics, flight software, guidance and navigation, missile systems, and advanced manufacturing. The company hires across aerospace engineering, embedded software, manufacturing, test engineering, avionics, cybersecurity, and operations—making it especially attractive to engineers, builders, veterans, and mission-driven professionals who want hands-on ownership of real hardware.

Unlike traditional defense contractors, Castelion operates with a startup-style engineering culture modeled after rapid aerospace development environments. Employees work closely with flight hardware, testing, and production systems in a fast-paced setting where speed, accountability, and execution are prioritized. The company openly emphasizes a builder mentality—giving team members the chance to own major projects and contribute directly to systems with national security impact.

As the U.S. military increases investment in hypersonic weapons, missile modernization, and scalable deterrence capabilities, Castelion continues to grow rapidly through major government contracts and manufacturing expansion. For professionals seeking a high-growth aerospace and defense company where they can help shape the future of national security technology, Castelion is quickly becoming one of the most exciting employers in the defense innovation ecosystem.

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