Sr Principal Systems Administrator with Security Clearance

Sr Principal Systems Administrator - Aurora, CO (Onsite) About the Role Join a high-impact technical team as a Sr Principal Systems Administrator supporting mission-critical government programs in Aurora, Colorado. This onsite position offers the opportunity to work with advanced Linux, Windows, VMware, and NAS technologies while maintaining and enhancing secure multi-user computing environments. Contribute to national security efforts and collaborate with talented engineers in a dynamic, growth-focused workplace. Responsibilities - Administer and maintain Linux (Red Hat Enterprise Linux) and Windows systems in classified environments - Manage VMware technologies and Network Attached Storage devices (NetApp ONTAP preferred) - Ensure system performance, reliability, and compliance through proactive enhancements, patching, and configuration - Coordinate with engineering and technical teams to support multi-user system operations - Implement and monitor backup, recovery, file systems, disk space, and virus protection measures - Oversee user and computer accounts, permissions, and security access lists - Maintain audit logs and security documentation as directed by the ISSM - Support Cyber Security initiatives and assist with security vulnerability remediation - Report on project status and contribute to both recurring and ad-hoc system administration tasks Required Skills and Experience - Ability to obtain and maintain Top Secret (TS/SCI) clearance with Full Scope Polygraph - Expertise in Linux (Red Hat Enterprise Linux) and Windows server administration - VMware administration experience - Proficiency with NAS storage device management (NetApp ONTAP preferred) - DoD 8570 IAT Level 2 certification (e.g., Security+ CE) or eligible to obtain within 6 months - Familiarity with classified environment system administration Preferred Skills - Advanced degree in a STEM field - 5+ years Red Hat Enterprise Linux (RHEL) administration in SCI environments - Experience with NISPOM, DCID 6/3-ICD 503, RMF, STIG, JAFAN, or JSIG frameworks - Enterprise storage, RAID-levels, vulnerability management (Tenable/Nessus) - Identity management, Active Directory, Windows 10/Server, GPOs - VMware ESXi (6.x+), host-based firewall configuration, documentation (Wiki/SharePoint) - Current certifications: Security+ CE, CASP, CISSP, or similar Benefits - Opportunities for career advancement and technical specialization - Exposure to cutting-edge government and security projects - Collaborative and supportive team environment - Comprehensive benefits package (medical, dental, vision, retirement) How to Apply Ready to safeguard critical systems and grow your career in a high-security environment? Submit your application and resume today to join our Aurora-based team.