Senior Linux System Administrator

Key Responsibilities

• System Administration & Maintenance: Administer, configure, troubleshoot, and maintain production and non-production RHEL and Ubuntu Server VMs and physical servers.
• Security Hardening & Compliance: Maintain CIS-aligned hardening on Ubuntu systems, working within the agency's existing security stack, including Azure-native tooling such as Defender for Cloud and Azure Policy. Support compliance reporting and remediation using this stack.
• Patching & Lifecycle: Manage patching through Ubuntu Pro (Livepatch and Extended Security Maintenance) and APT, minimizing manual patch orchestration and unplanned downtime.
• Automation & Scripting: Write and maintain automation in Bash and PowerShell to support a mixed Linux and Azure environment. Familiarity with implementing Cron jobs and other scheduled automations.
• Azure & DevOps Integration: Familiarity and experience with on-prem Azure DevOps for source control, pipelines, and CI/CD supporting Docker configuration and deployment to a Linux environment.
• Containers & Secrets Management: Support Docker workloads running on standalone Linux VMs (outside of Kubernetes or Azure Container Instance clusters), including integrating containers with Azure Key Vault.Experience with using Azure Container Registry, including Push/Pull and vulnerability scanning.
• Identity & Access Management: Maintain and secure SSSD-based identity integration, including sudoers governance and PAM configuration.
• Storage & Filesystem Management: Manage LVM, filesystems (XFS/EXT4), and partition layout, including dedicated mounts such as /var, /tmp, and /var/log/audit, in line with CIS guidance.
• Audit Support: Collaborate with the cybersecurity team to support audit findings, logging through auditd, and ongoing security posture, using the existing security stack and Azure-native tooling as the primary audit trail.

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Required Qualifications & Technical Skills

• 8+ years of hands-on Linux administration in enterprise or government environments, with deep expertise in current Ubuntu Server LTS releases.

• Working knowledge of Azure as an operating environment for Linux VMs, including networking, managed identity, and Key Vault integration.

• Experience with Azure DevOps, including pipelines, repositories, and CI/CD workflows involving Linux systems.

• Experience with Docker on Linux, including secrets management approaches for containers running outside of managed clusters.

• Advanced Bash scripting and working PowerShell proficiency for cross-platform automation.

• Understanding of UFW, SSH hardening, AppArmor, and SSL/TLS certificate management.

• Proficiency with systemd, kernel tuning via /etc/sysctl.conf, PAM, auditd, and log rotation.

• Ability to work independently with limited dedicated Linux peer support, as part of a small, cross-functional IT and security team.

Preferred Qualifications

• Certifications: Canonical/Ubuntu certifications, CISSP, or CompTIA Security+. AZ-900 and/or AZ-104 preferred.

• Healthcare or public sector experience, including state agency IT environments, MARS-E, HIPAA technical safeguards, or CMS security requirements. xhyhwjd

• Experience supporting development infrastructure with fast-changing workload requirements.