Linux and Windows Systems Administrator

Location: All work will be performed onsite in our Beavercreek, OH office.

Clearance: You must currently carry an active DoD Secret clearance to qualify for consideration.

Primary Responsibilities

• Administer and maintain Windows Workstations, Windows Server, and Linux systems (RHEL, Rocky Linux, Ubuntu) across physical, virtual, and air-gapped environments.

• Perform Tier 2 incident resolution, troubleshoot technical issues, conduct root-cause analysis, and collaborate with engineering, cybersecurity, and stakeholders to resolve complex problems.

• Execute system patching, vulnerability remediation, configuration management, and compliance activities.

• Implement and maintain monitoring, logging, backup and recovery solutions, and operational documentation/runbooks.

• Support account and access administration in accordance with least-privilege principles and organizational security policies.

• Automate repetitive administrative tasks using PowerShell, Bash, Ansible, or similar automation tools.

• Deploy and maintain operating system images using PXE/network boot, Kickstart, disk imaging, answer files, and automated installation methods.

• Perform system hardening and security compliance using DISA STIGs, SCAP, and NIST 800-53 security controls.

• Administer and troubleshoot Active Directory, DNS, DHCP, file servers, virtualization platforms, and Layer 2 network switching, including VLAN configuration, TCP/IP connectivity, and switch port administration in an air-gapped environment.

• Support dual-boot bare-metal systems and virtualized environments.

• Participate in after-hours support and on-call rotations as required.

• Research, analyze, and resolve Windows, Linux, and networking issues to maintain system availability, reliability, and performance.

Basic Qualifications

• Current Active DoD Secret security clearance.

• Current CompTIA Security+ certification.

• Bachelor's degree in a technical field with 2–4 years of relevant experience. Additional years of experience may be considered in lieu of a degree.

• Experience administering Windows Server and Linux systems in secure or air-gapped environments.

• Experience implementing DISA STIGs, SCAP, NIST 800-53 security controls, and system hardening practices.

• Experience administering:

  • Active Directory

  • DNS

  • DHCP

  • File Servers

• Experience building, integrating, maintaining, troubleshooting, and remediating Windows and Linux systems.

• Experience deploying operating systems using PXE, Kickstart, ISO/disk imaging, and automated installation methods.

• Experience configuring and troubleshooting Layer 2 switching, VLANs, TCP/IP, and network connectivity.

• Experience managing Windows and Linux updates, patching, and vulnerability remediation.

• Ability to develop automation scripts using PowerShell and Bash.

• Familiarity with Linux software repository management.

• Ability to work independently and collaboratively with minimal supervision.

• Strong analytical, communication, and problem-solving skills.

Preferred Qualifications

• Red Hat Certified System Administrator (RHCSA) certification.

• Experience administering VMware, Hyper-V, or other virtualized environments.

• Experience with automation and configuration management tools, including Ansible.

• Experience supporting secure or classified DoD environments.

• Knowledge of backup, recovery, logging, and monitoring solutions.

• Experience performing DISA STIG remediation, SCAP compliance validation, and vulnerability scanning using Tenable Nessus.