The posting
York is seeking a Systems Administrator to support and maintain classified computing environments that enable our space and ground systems missions. In this role, you will ensure compliance with U.S. government cybersecurity requirements, maintain secure system baselines, and collaborate closely with cross-functional engineering and cybersecurity teams. The ideal candidate brings experience across diverse platforms, takes initiative in securing complex systems, and thrives in a fast-paced environment supporting national security programs.
This role will be fully on-site in our Greenwood Village, Colorado office.
Responsibilities
Systems Administration & Configuration Management
Deploy, configure, and maintain hardware and software supporting classified systems Maintain secure baselines and system boundary configurations, including patch management, vulnerability remediation, and STIG implementation Perform proactive system administration, backups, and repository configuration per monitoring plans Participate in the change management process and assess system impacts of proposed changes
Cybersecurity Compliance & Assessment
Conduct vulnerability testing using ACAS/Nessus, SCAP, and related tools; remediate findings within required timelines Support testing and documentation of cybersecurity controls required for system accreditation Identify and maintain authorization boundary diagrams, architecture diagrams, and hardware/software inventories Ensure proper sanitization, archiving, and disposal of system resources in accordance with security plans
Cross-Functional Support & Collaboration
Provide technical inputs for ground assets supporting classified systems Work with engineering and operations stakeholders to integrate cybersecurity requirements into space and ground assets across development and operational phases Report security-related concerns and configuration changes that may impact system performance or accreditation to the ISSO/ISSM
This role will not have direct reports.
Required Qualifications
Bachelor’s degree in IT, Information Systems, Cybersecurity, or related field; or 5+ years of relevant experience 4+ years of systems administration experience supporting U.S. government or defense contractor environments Security+ certification or equivalent DoD 8570 baseline certification Proficiency administering Windows and Linux systems Hands-on experience applying DISA STIGs, SRGs, and SCAP to secure networked systems Experience with enterprise security tools such as HBSS, SIEM (Splunk preferred), MFA, HIDS/NIDS, and vulnerability assessment platforms) U.S. Citizenship Active Top Secret clearance (TS/SCI preferred if applicable) Willingness to work full-time in office in Greenwood Village, CO
Preferred Qualifications
Technical Expertise
Experience supporting hardware/software across standalone and LAN/WAN environments Ability to identify and remediate security vulnerabilities across networked devices and applications Knowledge of core IT security principles (firewalls, DMZs, encryption), PKI, and entitlements management Experience evaluating COTS/GOTS software for security considerations
Tools & Technologies
Working knowledge of virtualization technologies Ability to script in PowerShell, Python, or Bash Familiarity with switches, routers, and firewalls
Professional Skills
Strong written and verbal communication skills Self-driven and able to work independently in a dynamic environment
