Linux System Administrator, Denver with Security ...

Summary: Seeking an experienced, customer-facing Linux System Administrator to support efforts in a US Government Lab. All work will be on-site, in secure environment. Non-negotiable requirements: 1. TS/SCI clearance with CI Poly or better 2. college degree from an accredited university, or 5+ years of relevant experience 3. active CompTIA Security+ certification (or equivalent) This is a quick-turnaround requirement. Applicants must be identified by 22Apr26. Key Responsibilities• Design, implement, and maintain enterprise Linux environments with primary focus on Red Hat Enterprise Linux (RHEL)• Develop and maintain infrastructure automation using Puppet, Ansible, or similar configuration management tools• Manage physical and virtual server infrastructure across data center environments• Lead infrastructure projects from planning through implementation• Mentor junior administrators and provide technical guidance to team members• Perform hardware installations, upgrades, and troubleshooting in data center facilities• Implement security best practices, patch management, and compliance requirements• Monitor system performance, capacity planning, and optimization• Collaborate with cross-functional teams on infrastructure initiatives Required Qualifications• 8+ years of Linux system administration experience with strong Red Hat focus• Proven experience with automation tools (Puppet, Ansible, Chef, or SaltStack)• Hands-on data center experience including hardware installation and troubleshooting• 2+ years in a leadership or mentoring capacity (team lead, senior admin, or management)• Red Hat Certified System Administrator (RHCSA) or Red Hat Certified Engineer (RHCE) preferred• Strong scripting skills (Bash, Python, or similar)• Experience with virtualization platforms (VMware, KVM, or similar)• Understanding of networking fundamentals, storage systems, and backup solutions• Excellent problem-solving and communication skills Preferred Qualifications • Experience with containerization (Docker, Podman, Kubernetes)• Knowledge of Cl/CD pipelines and DevOps practices• Familiarity with monitoring tools (Nagios, Zabbix, Prometheus, etc.)• Experience with cloud platforms (A WS, Azure, GCP)

Created: 2026-05-09