Systems Administrator

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