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Mid-Level Linux Systems Administrator

4M ResearchHuntsville, ALPosted Sep 17, 2026 · open 39 days

Last confirmed open Oct 26, 2026

Full-timeMid LevelSecret

Before you apply

U.S. citizenship required
Only U.S. citizens can be hired for this role.
Secret clearance
An active clearance is required to start.
Bachelor's degree or equivalent experience
Experience or training can stand in for the degree.
CompTIA Security+, DoD 8570/8140
Certifications the posting names.
Travel up to 25%
The share of time spent travelling, as the posting states it.

4M Research, Inc. (4M) is a Woman owned small business established in 2007 and headquartered in Huntsville, AL. 4M specializes in Systems and Software Engineering and Analysis, Information Technology, Planning and Analysis, Health and Wellness Services and Field Support Services to a variety of customers including MDA, NASA, and AMCOM. Our continuous and rapid growth is attributable to the caliber of employees 4M strives to hire and retain.

4M Research is seeking a Mid-Level Linux Systems Administrator to join our team in Huntsville, AL.

The Administrator will be responsible for implementing DISA Security Technical Implementation Guides (STIGs), maintaining system compliance artifacts, and conducting day-to-day system operations in support of mission requirements and supporting program needs. The Administrator shall support system build-out and sustainment activities associated with the Risk Management Framework (RMF) accreditation of an Army Program of Record. Tasks include updating documentation (e.g., System Security Plan, Configuration Management Plan, Disaster Recovery Plan), performing FISMA-required artifact maintenance, conducting vulnerability assessments using approved tools, and supporting the Government with the management of POA&M items within eMASS.

Required Qualifications:

  • Bachelor's degree in a related field and 5+ years of relevant experience, or 7+ years professional experience in lieu of a degree.
  • Proven experience administering Red Hat Enterprise Linux systems in operational environments.
  • Demonstrated experience applying DoD STIGs and performing system hardening activities.
  • Experience supporting virtualized environments, particularly RHEL OpenShift.
  • CompTIA Security+ CE or equivalent in accordance with DoD 8570.01.
  • SECRET security clearance with the ability to obtain TS/SCI.
  • Ability to travel up to 25%.

Desired Qualifications:

  • Experience conducting STIG and SRG assessments using DISA-approved tools.
  • Familiarity with RMF processes, NIST security controls, and eMASS workflows.
  • Experience administering additional Linux and Windows operating systems.
  • Working knowledge of foundational networking concepts applicable to Linux systems.
  • TS/SCI security clearance.

Please Note: U.S. Citizenship is required

Qualified candidates should apply online at www.4mresearch.com.

4M Research, Inc. is an Affirmative Action/ Equal Opportunity Employer and an active participant in the Employment Eligibility Verification Program (E-Verify).

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Job Details
Location
Huntsville, AL
Type
Full-time
Level
Mid Level
Experience
5+ years
Posted
Sep 17, 2026
Required Skills
Red Hat Enterprise LinuxDoD STIGsSystem hardeningRHEL OpenShiftVirtualized environmentsCompTIA Security+ CEDoD 8570.01
Preferred Skills
STIG assessmentsSRG assessmentsDISA-approved toolsRMFNIST security controlseMASSLinuxWindowsNetworking

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