Millennium Space Systems

Classified Systems Administrator

IT - El Segundo, CA - Full Time

As a Millennium Space Systems' system administrator for classified systems, you will be working individually or with a small team to build, test, operate and maintain multiple classified systems and networks. A classified sysadmin must be able to manage both current systems and design and implement new systems or expansions to current systems and be open to supporting non-classified systems. This individual must be able to work autonomously and effectively communicate system and project statuses to management and provide end-users with instruction and training when necessary.


As a classified sysadmin, there are several tasks you will be responsible for on a daily, weekly, monthly, or recurring basis. These include but are not limited to:

  • System Administration
  • Network Administration
  • System and Network Security
  • Design / install new / maintain / rebuild existing physical servers and virtual machines implemented via VMware vSphere and Microsoft Hyper-V running Microsoft Windows and Linux operating systems
  • Design / install new / maintain / rebuild existing server applications
  • Supports the design / installation / maintenance / reconfiguration of network equipment and infrastructure
  • Design / install new / maintain information security controls 
  • Develop and document procedures, guidelines, and techniques for the management and operation of system and networking hardware and software
  • Maintains current knowledge of system and network technologies and recommends improvements
  • Deploy, operate, and maintain for corporate and classified networks security tools and processes to support system hardening and analysis, endpoint protection, spam and malware protection, network and system intrusion detection and prevention, vulnerability scanning, patch management, asset management, security test and evaluation, assessment and authorization

Minimum Qualifications:

  • 5 years of directly related experience
  • Active Top Secret security clearance with recent SSBI
  • Certification(s) and experience commensurate with Information Assurance Techician Level II (IAT Level II) as specified by DoD 8570.01-M or the ability to be compliant within 6 months of employment
  • Experience in classified environments (DoD, SCI, SAP)
  • Working knowledge of the Risk Management Framework as provided by NIST Special Publication (SP) 800-37, controls provided in NIST SP 800-53, and assessments provided by NIST SP 800-53A and derived policies, such as the Intelligence Community Directive Number 503 (ICD-503) or the Joint Special Access Program (SAP) Implementation Guide (JSIG)
  • Working knowledge and experience with implementing security controls as part of industry standard system hardening or in accordance with customer or government requirements
  • Ability to communicate complex concepts with senior management, technical personnel, and external entities including senior representatives of the US Government and teammates
  • Experience with Windows operating systems such as Windows 7, 10, Windows Server 2008 R2, 2012 R2, and Microsoft Active Directory with regards to basic management such as managing computer and user accounts

Preferred Qualifications:

  • Familiarity with Public Key Infrastructure (PKI) and other authentication / encryption frameworks
  • Familiarity with system assessment and authorization procedures
  • Microsoft certifications for Windows desktop and server operating systems
  • Cisco or other network certifications
  • Security+ or other security certifications


  • Millennium is DDTC-registered, ITAR-compliant Company. This position is located at a facility that requires special access. Applicants MUST be U.S. citizens and eligible for a security clearance. Additionally, applicants must be willing to apply for and maintain a security clearance.
  • We encourage veterans, disabled veterans and disabled individuals to apply for any open position for which they feel they are qualified.
  • We are proud to be an Affirmative Action/Equal Opportunity Employer.
Apply: Classified Systems Administrator
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