Remote- Senior Linux System Administrator

• Position: Senior Linux System Administrator
• Duration: 12 Months, with possible extension

Position Overview

The Senior Linux System Administrator will be responsible for operating, maintaining, securing, and automating Red Hat, Ubuntu, and other Linux systems across on-premises and Azure environments, including Azure CommercialC and Azure Government.

The ideal candidate will have strong Linux administration experience combined with hands-on knowledge of Azure, Azure DevOps, Docker, security hardening, automation, and identity management.

Key Responsibilities

• Administer, configure, troubleshoot, and maintain production and non-production RHEL and Ubuntu servers and VMs.
• Perform CIS-aligned Linux security hardening and remediation.
• Work with Microsoft Defender for Cloud and Azure Policy for security posture and compliance.
• Manage Ubuntu patching using Ubuntu Pro, Livepatch, ESM, and APT.
• Develop and maintain automation using Bash and PowerShell, including Cron-based scheduled jobs.
• Support Azure DevOps repositories, pipelines, CI/CD workflows, and Linux-based deployments.
• Support Docker workloads running on standalone Linux VMs.
• Integrate container workloads with Azure Key Vault and Azure Container Registry (ACR).
• Manage SSSD identity integration, sudoers governance, and PAM configuration.
• Administer LVM, XFS/EXT4 filesystems, partitions, and dedicated mounts such as /var, /tmp, and /var/log/audit.
• Support audit findings, auditd logging, compliance activities, and cybersecurity initiatives.
• Troubleshoot and optimize Linux systems while maintaining security and availability.

Required Qualifications

• 8+ years of hands-on Linux system administration experience in enterprise or government environments.
• Strong expertise with current Ubuntu Server LTS releases and RHEL.
• Experience administering Linux VMs in Microsoft Azure.
• Knowledge of Azure networking, managed identities, and Key Vault.
• Hands-on experience with Azure DevOps, repositories, pipelines, and CI/CD.
• Experience with Docker on Linux, including container secrets management.
• Advanced Bash scripting and working knowledge of PowerShell.
• Strong knowledge of UFW, SSH hardening, AppArmor, and SSL/TLS certificates.
• Experience with systemd, /etc/sysctl.conf, PAM, auditd, and log rotation.
• Ability to work independently within a small, cross-functional IT/security team.

Preferred Qualifications

• Ubuntu/Canonical certifications, CISSP, or CompTIA Security+.
• AZ-900 and/or AZ-104 certification.
• Healthcare or public-sector IT experience.
• Familiarity with MARS-E, HIPAA technical safeguards, or CMS security requirements.
• Experience supporting development infrastructure with rapidly changing workloads.