Linux System Administrator (FULLSCOPE POLYGRAPH) with Security Clearance

Aurora, Colorado

TEKsystems c/o Allegis Group
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Linux System Administrator - FULLSCOPE POLYGRAPH REQUIRED Job responsibilities will include, but not be limited to, the following:
• Perform as a Linux System Administrator on large government contracts.

• Perform administration on VMware technologies (or related)

• Maintain smooth operation of multi-user computer systems, including coordination with network, software, and system engineers, PC desktop technicians, project managers, end users, and customer and IT management.

• Recommend and implement system enhancements that will improve the performance and reliability of the system including installing, upgrading/patching, monitoring, problem resolution, and configuration management.

• Provide backup and recovery services; manage file systems and disk space; manage virus protection on a routine basis.

• Create and maintain user and computer accounts and modify file permissions and security access lists.

• Test new releases of products to ensure compatibility and minimize user impact.

• Develop and document technical processes and procedures as needed.

• Interact, meet, discuss, and troubleshoot issues with vendors; evaluate vendor products, services, and suggestions.

• Adhere to strict Information Systems security guidelines in all cases.

• Maintain security audit and logging information on all classified networked and standalone computers as directed by the Information Systems Security Manager (ISSM).

• Prepare security documentation for Cyber Security team. Basic Qualifications:
• Candidate must have active/current Top Secret/SCI clearance with adjudicated Full Scope Polygraph to be considered
• Must have server administration experience with Linux (RedHat Enterprise Linux is preferred)

• Must have a DOD 8570 IAT Level 2 baseline certification (example: Security+ CE, CISSP)

• Ability to lift equipment weighing up to 40 pounds.

• Ability to support after hours and on weekends as needed. Preferred Qualifications :
• Higher degree in a STEM-related discipline

• Security+ CE

• 5+ years of experience with Red Hat Enterprise Linux (RHEL) server administration in an SCI classified environment

• Experience operating under and managing systems within NISPOM Chapter 8, DCID 6/3-ICD 503, RMF, STIG, JAFAN, or JSIG information system environments

• Experience with NAS storage device (preferably NetApp) administration (ONTAP 8.x or higher; CDOT)

• Solid understanding of Enterprise-level storage concepts to include all commonly used RAID-levels

• Solid understanding of remediating security vulnerabilities; Experience hardening Linux systems in accordance with RMF and STIGs

• Identity Management (Single Sign-On) experience

• VMware and ESXi (6.x or higher) configuration and management experience

• Experience with host-based firewall implementations and configuration (Redhat "iptables")

• Windows 10 administration experience; Windows Server experience; Group Policies (GPOs) experience; Active Directory management experience

• Solid writing skills and use of Wiki pages and Sharepoint sites for documentation

• DoD 8570 Certification in a primary OS (Windows, Linux, Cisco)

• Experience in VMWare, NetApp and Splunk among other industry standard technologies. Comfortable with maintenance and OS upgrades
• Preferred candidate will be familiar with Tenable and Nessus scans for vulnerability and controls implementation.
Date Posted: 10 June 2025
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