Linux Administrator

EHS Technologies Corporation; Philadelphia (Philadelphia County); On-site; USD 100,000 - 130,000; Full time

Job summary

The Linux Administrator at EHS Technologies Corporation provides administration, security hardening, and operational support for Linux-based systems within a DoD environment. The role focuses on secure, reliable, and compliant infrastructure, including patching, vulnerability remediation, and DoD cybersecurity requirements.

Responsibilities include configuring Red Hat, Ubuntu, and CentOS servers, applying STIGs, monitoring performance, managing access, and automating routine tasks with Bash,

Qualifications

• Bachelor’s degree in a related technical discipline.
• Six years of relevant professional Linux experience.
• Experience securing and hardening Linux systems.
• Experience applying and validating DISA STIGs.
• Experience with Linux patching and vulnerability remediation.
• Working knowledge of Linux administration, access controls, monitoring, backup/recovery, and troubleshooting.
• Experience with Bash, Perl, and Python scripting.

Responsibilities

• Install, configure, administer, and maintain Linux servers (Red Hat, Ubuntu, CentOS).
• Secure Linux systems per DoD cybersecurity requirements and security policies.
• Apply and remediate DISA STIGs.
• Patch OS and remediate vulnerabilities.
• Review vulnerability scans and implement corrective actions.
• Monitor system performance, availability, capacity, and security.
• Troubleshoot OS, application, and connectivity issues.
• Manage user accounts, groups, permissions, and privileged access.
• Configure Linux-hosted services (web servers, databases, file systems).
• Implement backup, recovery, and DR capabilities.
• Automate routine tasks using Bash, Perl, and Python.
• Support deployments and collaborate with DevOps, cybersecurity, and development teams.
• Maintain system documentation and configurations.
• Ensure compliance with DoD security policies and baselines.

Skills

Linux administration

Security hardening

DISA STIGs

Vulnerability remediation

Bash scripting

Python

Automation

Backup and recovery

Monitoring

AD domain knowledge

Education

Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, Engineering, or a related technical discipline

Tools

Red Hat

Ubuntu

CentOS

Active Directory

DNS

DHCP

Job description

Description

The Linux Administrator provides administration, security hardening, maintenance, and operational support for Linux-based systems within a Department of Defense (DoD) environment. The position is responsible for maintaining secure, reliable, and compliant Linux infrastructure while supporting day-to-day operations, vulnerability remediation, system patching, and DoD cybersecurity requirements

Responsibilities:

• Install, configure, administer, and maintain Linux servers, including Red Hat, Ubuntu, and CentOS environments.
• Secure Linux systems in accordance with DoD cybersecurity requirements, security policies, and industry best practices.
• Apply, validate, and remediate applicable DISA Security Technical Implementation Guides (STIGs).
• Perform operating system and security patching, system updates, and vulnerability remediation.
• Review vulnerability scan results, investigate findings, and implement corrective actions to maintain system compliance.
• Monitor system performance, availability, capacity, and security using appropriate monitoring and management tools.
• Troubleshoot and resolve operating system, application, configuration, performance, and connectivity issues.
• Manage user accounts, groups, permissions, privileged access, and access controls.
• Configure and maintain Linux-hosted services, including web servers, databases, file systems, and related infrastructure services.
• Implement and maintain backup, recovery, and disaster recovery capabilities.
• Automate routine system administration and maintenance activities using scripting languages such as Bash, Perl, and Python.
• Support application and infrastructure deployments and collaborate with DevOps, engineering, cybersecurity, and development teams.
• Maintain system documentation, configuration records, standard operating procedures, and technical documentation.
• Support configuration management, audit logging, security monitoring, and other controls required to maintain secure DoD computing environments.
• Ensure systems remain compliant with applicable DoD security policies, technical standards, and approved configuration baselines.
• . Knowledge of and experience with installation, configuration, and integration, backups, troubleshooting, and problem resolution for servers associated with an Active Directory domain, such as DHCP and DNS

Requirements

Target Requirements:

• Bachelor’s degree in Computer Science, Information Technology, Cybersecurity, Engineering, or a related technical discipline.
• Six (6) years of relevant professional experience administering and supporting Linux systems.
• Demonstrated experience securing and hardening Linux systems.
• Experience applying and validating DISA STIGs and remediating associated findings.
• Experience with Linux operating system patching, vulnerability remediation, and configuration management.
• Working knowledge of Linux system administration, access controls, system monitoring, backup/recovery, and troubleshooting.
• Experience with automation and scripting using Bash, Perl, and Python, or similar technologies.