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Systems Administrator with Security Clearance

TEKsystems c/o Allegis Group

Aurora, CO

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JOB DETAILS
SKILLS
Access Control, Administrative Skills, Antivirus, CISSP - Certified Information Systems Security Professional, CompTIA Security+, Computer Maintenance, Computer Security, Configuration Management, DCID - Director of Central Intelligence Directive, Data Recovery, Desktop PC, DoD Directive 8140, DoD Directive 8570, Environmental Sciences, File Systems, Firewall Administration, Full Scope Polygraph, Government, Government Contracts, IAT - Information Assurance Technical, IT Requirements, Identify Issues, Identity Data Management, International Classification of Diseases (ICD), Internet Security, Leading Edge Technology, Linux Administration, Maintain Compliance, Microsoft Active Directory, Microsoft Windows NT Group Policy, Microsoft Windows Operating System, Microsoft Windows Server, Microsoft Windows System Administration, Multi-User Systems, NetApp Storage Systems, Network Attached Storage (NAS), Network Software, Performance Management, Product Testing, Project/Program Management, RAID Storage, Red Hat Linux Operating System, Regulatory Compliance, Reliability Engineering, Security Auditing, Security Clearance, Sensitive Compartmented Information (SCI), Single Sign-On (SSO), Software Engineering, Software Patches, Software Validation, Systems Administration/Management, Systems Engineering, Technical Leadership, Technical Writing, Testing, Top Secret Clearance, User Account Administration, VMWare, VMWare ESX/ESXi, VMWare vSphere, Vendor/Supplier Relations, Virtualization, iptables
LOCATION
Aurora, CO
POSTED
2 days ago
Systems Administrator (TS/SCI w/ Full Scope Poly) Clearance: Top Secret with SCI eligibility and Full Scope Polygraph – Required Overview We are seeking an experienced Linux Systems Administrator to support large-scale government programs in a highly classified environment. This role involves administering enterprise Linux and virtualized systems while adhering to strict cybersecurity and compliance standards. You will work with cutting-edge technologies alongside a highly skilled team supporting critical national security missions. Required Skills & Qualifications Active TS/SCI with Full Scope Polygraph
5+ years of Red Hat Enterprise Linux (RHEL) administration in an SCI-classified environment
VMware vSphere / ESXi 6.x or newer configuration and management experience
Active Directory administration and Group Policy (GPO) experience
DoD 8570 IAT Level II certification (e.g., Security+ CE, CISSP)
Ability to support after-hours and weekend operations as required Primary Responsibilities Perform Linux System Administration on large government contracts
Administer and support VMware virtualization technologies
Maintain reliable operation of multi-user systems in coordination with: Network, software, and system engineers
Desktop technicians
Project managers, end users, and IT leadership Recommend and implement system enhancements to improve performance, reliability, and security
Perform system patching, upgrades, monitoring, troubleshooting, and configuration management
Manage backups, recovery operations, file systems, disk space, and virus protection
Create, modify, and maintain user and computer accounts, permissions, and access controls
Test and validate new software releases to ensure compatibility and minimize user impact
Develop and maintain technical documentation, processes, and procedures
Interface with vendors to troubleshoot issues and evaluate products and services
Ensure compliance with all Information Systems Security requirements
Maintain security audit logs per ISSM direction
Prepare required security documentation for Cybersecurity teams Nice‑to‑Have / Preferred Qualifications Degree in a STEM-related discipline
Experience operating within NISPOM Chapter 8, RMF, ICD 503, DCID 6/3, JAFAN, or JSIG
NAS storage administration experience (preferably NetApp ONTAP 8.x+ / CDOT)
Enterprise storage knowledge including RAID architectures
Linux hardening and vulnerability remediation using STIGs and RMF
Host-based firewall configuration (e.g., iptables)
Identity Management / Single Sign-On experience
Windows 10 and Windows Server administration
Experience with Splunk, Tenable, Nessus, VMware and NetApp maintenance and upgrades
Strong documentation skills using Wiki and SharePoint
Additional DoD 8570 certifications (Linux, Windows, or network platforms) Employee Value Proposition
Join a large government integrator supporting critical national security missions in Denver, CO. Work in a classified environment leveraging cutting-edge technologies alongside experienced engineers and cybersecurity professionals. Pay and Benefits Eligibility requirements apply to some benefits and may depend on job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, benefits for this temporary role may include: Medical, dental, and vision insurance
Critical Illness, Accident, and Hospital coverage
401(k) Retirement Plan (Pre‑tax and Roth post‑tax contributions available)
Life Insurance (Voluntary Life & AD&D for employee and dependents)
Short‑ and long‑term disability
Health Spending Account (HSA)
Transportation benefits
Employee Assistance Program
Time Off / Leave (PTO, Vacation, or Sick Leave)

About the Company

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TEKsystems c/o Allegis Group

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