Job Description
Linux Systems Administrator
Location: Dahlgren, VA
Schedule: Hybrid (3 days onsite / 2 days remote)
Clearance: TS or Interim TS (must be able to obtain/maintain Top Secret)
Overview
Seeking a Linux Systems Administrator (UNIX) to support a Research, Development, Testing & Engineering (RDT&E) environment. This role provides Tier III support for Linux-based servers and workstations across classified and unclassified environments, supporting engineering and computational workloads.
Key Responsibilities Required Qualifications Certifications Physical Demands
Location: Dahlgren, VA
Schedule: Hybrid (3 days onsite / 2 days remote)
Clearance: TS or Interim TS (must be able to obtain/maintain Top Secret)
Seeking a Linux Systems Administrator (UNIX) to support a Research, Development, Testing & Engineering (RDT&E) environment. This role provides Tier III support for Linux-based servers and workstations across classified and unclassified environments, supporting engineering and computational workloads.
Key Responsibilities
- Administer, maintain, and support Red Hat Enterprise Linux (RHEL 7.x) systems
- Provide Tier III troubleshooting and system performance optimization
- Implement automated system deployments (e.g., Kickstart / Anaconda)
- Apply and maintain DISA STIG compliance within configuration-managed environments
- Support PKI-based authentication and secure access controls
- Administer servers and end-user workstations in classified and unclassified LAN/WAN environments
- Perform system analysis and implement solutions to improve system performance and reliability
- Install, configure, patch, and maintain operating systems and applications
- Manage users, groups, and centralized authentication services
- Configure 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 reports
- Develop and maintain shell scripts to automate administrative tasks
- Manage backup/recovery, software distribution, and license tracking
- Collaborate with engineers supporting compute-intensive workloads
- Participate in hardware planning, vendor coordination, and cross-team collaboration
- 4–6 years of Linux system administration experience
- Experience supporting Linux-based servers and workstations
- Hands-on experience with:
- Red Hat Enterprise Linux (RHEL 7.x)
- DISA STIGs and DoD security compliance
- Strong knowledge of:
- Linux system operations and command-line tools
- Networking fundamentals in LAN/WAN environments
- System security (firewalls, SELinux, access controls)
- Experience in classified and/or secure environments preferred
- Strong troubleshooting, analytical, and problem-solving skills
- Ability to multi-task and provide end-user support
- Strong written and verbal communication skills
- DoD 8570/8140 IAT Level II certification required
- Acceptable certifications include: Security+ CE, GSEC, SSCP, CCNA-Security (or equivalent)
- Ability to lift up to 10–20 pounds
- Ability to stand and walk for extended periods
- Ability to bend, twist, and squat periodically
Numbers & Facts
| Location | Dahlgren, VA |
| Industry | Computer/IT Services |
| Salary | $58–$60 Per Hour |
| Company Size | 500 to 999 employees |
| Website | https://www.apolisrises.com/ |
Benefits
Paid Sick Days, Employee Referral Program, Employee Events, Retirement / Pension Plans
About Company
Since 1996, RJT has provided successful SAP, Oracle, and IT consulting solutions and staffing services to clients around the world. The new Apolis brings you the same personalized service fortified with a greater array of IT solutions, global expertise, and cost-management strategies.
We are a global IT consultancy that seamlessly integrates experts and leading-edge solutions into your organization so you can focus on what really matters.
Skills
- Access Controlunmatched
- Administrative Skillsunmatched
- Analysis Skillsunmatched
- Authenticationunmatched
- Command Lineunmatched
- Communication Skillsunmatched
- Computational Engineeringunmatched
- Computer Securityunmatched
- Cryptographyunmatched
- DNS (Domain Name System)unmatched
- Data Recoveryunmatched
- Defense Information Systems Agency (DISA)unmatched
- DoD Directive 8140unmatched
- DoD Directive 8570unmatched
- Environmental Managementunmatched
- File Systemsunmatched
- Firewallsunmatched
- HTTP (HyperText Transport Protocol)unmatched
- HTTPS (HyperText Transport Protocol Secure)unmatched
- Help Deskunmatched
- IAT - Information Assurance Technicalunmatched
- Identify Issuesunmatched
- Lift/Move 20 Poundsunmatched
- Linux Administrationunmatched
- Linux Operating Systemunmatched
- Local Area Network (LAN)unmatched
- Logical Volume Manager (LVM)unmatched
- Maintain Complianceunmatched
- Multitaskingunmatched
- NAT (Network Address Translation)unmatched
- NFS (Network File System)unmatched
- NTPunmatched
- Network Configuration Managementunmatched
- Operating Systemsunmatched
- Performance Analysisunmatched
- Performance Managementunmatched
- Performance Tuning/Optimizationunmatched
- Presentation/Verbal Skillsunmatched
- Problem Solving Skillsunmatched
- Public Key Infrastructure (PKI)unmatched
- Red Hat Linux Operating Systemunmatched
- SMTP (Simple Mail Transfer Protocol)unmatched
- SSH (Secure Shell)unmatched
- Security Complianceunmatched
- Security-Enhanced Linux (SELinux)unmatched
- Software Distributionunmatched
- Software Licensesunmatched
- Software Patchesunmatched
- System Operationsunmatched
- Systems Administration/Managementunmatched
- Systems Analysisunmatched
- Systems Maintenanceunmatched
- Systems Reliabilityunmatched
- Team Lead/Managerunmatched
- Technical Supportunmatched
- Test Plan/Scheduleunmatched
- Top Secret Clearanceunmatched
- United States Department of Defense (DoD)unmatched
- Unix Shell Programmingunmatched
- Unix System Administrationunmatched
- Vendor/Supplier Planningunmatched
- Wide Area Network (WAN)unmatched
- Writing Skillsunmatched
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