Journeyman Linux Systems Administrator, Senior-Level

Journeyman Linux Systems Administrator, Senior-Level

SimTech, Inc., recognized as one of the 2026 Best Places for Working Parents, is seeking a Journeyman Linux Systems Administrator, Senior-Level to join our dynamic and diverse team in Huntsville, AL. This is an immediate opening with opportunities for growth and professional development.

SimTech offers a market leading compensation package with excellent benefits, work/life balance, outstanding retirement plan, career advancement and much more.

The Journeyman Linux Systems Administrator, Senior-Level will work with a team to monitor, update, and support a Hardware-in-the-loop (HWIL) fully implemented lab. Perform firmware updates, software updates, network configurations, and standing up new systems. Required travel for up to 4 weeks at a time to support Flight Tests.

Primary responsibilities include installation, configuration and maintenance of system hardware, software, and related infrastructure on multiple UNIX/Linux hardware platforms within a classified environment.

Provide Mid-Level Linux system administration support for computer systems/users participating in MDA test events.

Develop Plans of Action & Mitigation (POA&M) to document deviations from approved DISA STIG requirements.

Monitor system cybersecurity compliance scans to ensure scans are complete and authenticated.

Provide troubleshooting support for hardware and software.

Provide technical support for hardware and software installations of Tactical and Commercial off the Shelf (COTS) hardware.

Monitor system audit logs, archives, backups and user activity to verify system integrity and review for unauthorized access.

Perform regular Configuration Management audits to maintain compliance with system baselines.

Manage user accounts on classified systems in a multi-factor authentication (MFA) environment to include establishment, disabling, and deletion per approved processes.

Create and manage role-based privileged user accounts.

Perform DISA SCC SCAP and NESSUS cybersecurity scans, IAVM patch installation, and manual system configurations in accordance with DISA STIGs.

Perform system backup and restore procedures and verify compliance.

Develop, track, and maintain status of the baseline configuration for each deployed system using existing tooling.

Ability to travel to remote locations and support fielded Army training exercises.

Perform other duties in support of this effort.

Bachelor's Degree in related field from an accredited institution required.

10+ years of demonstrated experience is required. A combination of relevant education and/or demonstrated experience may be substituted.

Demonstrated understanding of NTP time management processes.

Knowledge of the RMF process leading to acquiring and maintaining an ATO.

AI experience is a plus (but not a requirement).

Required travel for up to 4 weeks at a time to support Flight Tests.

U.S. Citizenship with Active Secret Security clearance and the ability to maintain the designated security clearance level is required.

Employees in these positions will function in a general office/cubicle setting environment, and laboratory/testing setting using standard office equipment and various electronic testing equipment, including a computer, telephone, printers, video equipment, computer software and testing equipment. Will interact in a general office setting environment with various personnel; participate in meetings and contribute to team success; deliver timely results and produce reports; receive and communicate information. May function in a specialized laboratory/testing environment using electronic testing equipment, computer software and complex systems. May move and test equipment of various weights. Laboratory environment may require use of protective equipment (PPE) including but not limited to safety glasses and protective hearing and footwear. May be expected to work varying shifts and hours to ensure successful operation of activities in the organization due to business demands; travel required for assigned work.

The performance of this position may occasionally require exposure to other environments such as labs and testing areas, which may require the use of personal protective equipment such as safety glasses, mandatory hearing protection and other safety devices required for a particular area.

SimTech's mission is to be the most reliable and cost-effective provider of Signature Models, Simulations, Hardware, Software, Cyber solutions, and Test & Evaluation services. Established in 1983 by a team of experienced scientists and engineers, SimTech has a long history of delivering high-technology defense-oriented solutions.

The company has been recognized as a "Best Place to Work" in 2020 and 2021, and as a "Best Place for Working Parents" in 2022-2026 by the Huntsville/Madison County Chamber of Commerce.

SimTech offers an industry-leading comprehensive compensation and benefits package. Be a part of over 43+ years of excellence-join our team today!

To learn more about our exceptional team and employee benefits, contact SimTech HR or visit www.simtechinc.com for more information.

SimTech, Inc. is an Equal Opportunity/Affirmative Action Employer. SimTech, Inc. is a committed EOE/Vet/Disabled employer.

Simulation Technologies, Inc. (SimTech) is an Equal Employment Opportunity employer and provides reasonable accommodation for qualified individuals with disabilities and disabled veterans in its job application procedures. If you have any difficulty using our online system and you need an accommodation due to a disability, you may use the following email address, HR@simtechinc.com and/or phone number (256.428.2910) to contact us about your interest in employment with SimTech.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, genetic information, citizenship, ancestry, marital status, protected veteran status, disability status or any other status protected by federal, state, or local law. SimTech participates in E-Verify.