Linux Systems Admin

Job#: 3032376Job Description:Linux Systems Administrator (UNIX) – RDT&E EnvironmentLocation: Dahlgren, VASchedule: Hybrid (3 days onsite / 2 days remote)Salary: $125,000 – $135,000Clearance: TS or Interim TS (must be able to obtain/maintain Top Secret)Level: Mid-Level (No COR resume review required)OverviewApex Systems is seeking a Linux Systems Administrator (UNIX) to support a Research, Development, Testing & Engineering (RDT&E) environment in Dahlgren, VA. This role provides Tier III support for Linux-based servers and workstations across classified and unclassified environments, supporting engineering and computational workloads.Key ResponsibilitiesAdminister, maintain, and support Red Hat Enterprise Linux (RHEL 7.x) systemsProvide Tier III troubleshooting and system performance optimizationImplement automated system deployments (e.g., Kickstart / Anaconda)Apply and maintain DISA STIG compliance within configuration-managed environmentsSupport PKI-based authentication and secure access controlsAdminister servers and end-user workstations in classified and unclassified LAN/WAN environmentsPerform system analysis and implement solutions to improve system performance and reliabilityInstall, configure, patch, and maintain operating systems and applicationsManage users, groups, and centralized authentication servicesConfigure and manage:Storage (partitions, LVM)File systems (permissions, ACLs, encryption, NFS)Logging (including remote logging)Networking services (HTTP/HTTPS, DNS, SMTP, SSH, NTP)Network configurations (static routes, NAT, packet filtering)Monitor system performance and deliver utilization and health reportsDevelop and maintain shell scripts to automate administrative tasksManage backup/recovery, software distribution, and license trackingCollaborate with engineers supporting compute-intensive workloadsParticipate in hardware planning, vendor coordination, and cross-team collaborationRequired Qualifications4–6 years of Linux system administration experienceExperience supporting Linux-based servers and workstationsHands-on experience with:Red Hat Enterprise Linux (RHEL 7.x)DISA STIGs and DoD security complianceStrong knowledge of:Linux system operations and command-line toolsNetworking fundamentals in LAN/WAN environmentsSystem security (firewalls, SELinux, access controls)Experience in classified and/or secure environments preferredStrong troubleshooting, analytical, and problem-solving skillsAbility to multi-task and provide end-user supportStrong written and verbal communication skillsCertificationsDoD 8570/8140 IAT Level II certification requiredAcceptable certifications include: Security+ CE, GSEC, SSCP, CCNA-Security (or equivalent)Security Clearance RequirementsMust be able to obtain and maintain a Top Secret (TS) clearanceActive TS or Interim TS preferredU.S. Citizenship required (clearance eligibility requirement)Physical DemandsAbility to lift up to 10–20 poundsAbility to stand and walk for extended periodsAbility to bend, twist, and squat periodicallyPreferred QualificationsExperience supporting DoD or RDT&E environments (e.g., NSWC Dahlgren)Familiarity with Windows operating systems in mixed environmentsExperience with virtualization technologies and VM managementExposure to engineering or high-performance computing environmentsNotesMid-level role (no COR review required)Designed for candidates with strong hands-on Linux experience in secure environmentsEverforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details.Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details.Everforth Apex Benefits Overview: Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.© 2026 Everforth, Inc. All rights reserved.Everforth Apex Systems is part of the Commercial Segment of Everforth, Inc.NYSE: EFOR4400 Cox RoadSuite 200Glen Allen, Virginia 23060Everforth Apex is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex.