Sr. Linux Administrator

Job Locations US-AL-Huntsville
Business Unit
Secret Clearance Preferred


i3 is seeking a Senior Linux Administrator to support an Army Contract. The Linux Admin will provide technical expertise supporting RHEL/CentOS Information Systems in an enterprise environment for a large (8000+) user community. The Linux Admin must have experience interpreting and applying the DISA STIG’s. The Linux Administrator must have a customer centric approach and provide all level of support for the technical and cyber team as well as the user base community.


A successful candidate will:

  • Configure, build, install, and administer Linux operating systems in accordance with approved baselines, best practices, and DISA STIGs in a virtual environment.
  • Responsible for loading and supporting required system software including respective office software, additional products in the Microsoft and Linux suite of software, test applications and GOTS software.
  • Support, troubleshoot and resolve software/hardware conflicts/problems on RedHat Enterprise Linux, CentOS, and Ubuntu workstations in a virtual environment.
  • Analyze and implement security posture of Linux environment based on DISA STIGs and SCAP data, NIST guidance, vendor Security Review Guides (SRGs) and best practices.
  • Provide updated STIGs to the Cybersecurity Team to maintain RMF compliance in support of approved ATO.
  • Experience with Linux authentication using Centrify with Active Directory and two factor authentication utilizing CAC. (Experience with local, LDAP, Samba w/AD a plus)
  • Possess strong script troubleshooting and generation for applying STIG requirements.
  • Assist in maintaining system documentation such as SOPs and policies.
  • Understanding of information Assurance (IA) systems and practices, such as DISA STIGs, RMF, and system hardening.
  • Provide direct customer service and technical support to local and remote users as required via phone, e-mail, on-line systems and in person.
  • Interacts with users and evaluates vendor products.
  • Maintains current knowledge of relevant technologies as assigned.
  • Experience writing and developing playbooks using Ansible (Experience with Puppet is a plus).
  • Troubleshoot NFS and SAMBA shares.
  • Maintain repository mirrors for Linux OS updates for CentOS and Ubuntu.
  • Build DevOps environment running Ansible CFG management and GitLab.


  • BS and 5-10 years of relevant experience required.
  • DoD 8570.01-M compliant.
  • Ability to obtain and maintain a SECRET clearance.
  • Ability to work with little or no direct supervision and in a team environment.
  • Must have Excellent Customer Service Skills.


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