Senior Linux/Unix System Administrator

Job Summary

We are seeking an experienced Senior Linux/Unix System Administrator with 6-8+ years of enterprise infrastructure experience to support and maintain mission-critical Linux environments. The ideal candidate will have strong expertise in Red Hat Enterprise Linux (RHEL), Oracle Linux, Ansible automation, Linux clustering, storage administration, and scripting. This role requires hands-on system administration, patching, automation, troubleshooting, and production support in a highly available enterprise environment.

Required Experience

• 6-8+ years of Linux/Unix System Administration experience in enterprise environments.
• Bachelor's degree in Computer Science, Information Technology, or a related field (or equivalent experience).
• Experience supporting production infrastructure with minimal supervision.
• Ability to participate in a 24x7 on-call rotation and support after-hours maintenance.
• Former Exelon contractors must be eligible for a new 12-month assignment and be in good standing.

Required Technical Skills

• Expert administration of: Red Hat Enterprise Linux (RHEL 6/7/8/9), Oracle Linux, Unix environments.
• Experience with: Ansible (Playbooks, build automation, patch automation), Linux scripting (Bash/Bourne Shell, Python, Perl, or Java), Red Hat PCS Clustering, Storage administration (ZFS, LVM, Veritas).
• Support VMware virtual infrastructure and production Linux environments.
• Monitor system health, performance, backups, and security compliance.
• Plan and implement security patching and operating system upgrades.
• Maintain accurate server documentation and configuration records.
• Support production releases, infrastructure changes, and disaster recovery activities.
• Rack and stack servers when required.
• Collaborate with infrastructure, application, database, and network teams to resolve complex technical issues.
• Drive automation initiatives to improve operational efficiency.
• Participate in 24x7 on-call support and scheduled maintenance windows.

Preferred Skills

• Solaris administration, Oracle Clusterware, Veritas InfoScale, Oracle Exadata, Oracle Cloud Infrastructure (OCI), Microsoft Azure administration, SAN, NAS, RAID, Backup technologies, VMware administration certifications (Red Hat, Azure, Oracle Cloud, or VMware).

Key Responsibilities

• Administer and maintain enterprise Linux servers (RHEL, Oracle Linux).
• Install, configure, patch, upgrade, and troubleshoot operating systems and server hardware.
• Build and automate server provisioning using Ansible and scripting.
• Configure and maintain Linux clustering and high-availability solutions.
• Manage storage technologies including ZFS, LVM, and Veritas.
• Support VMware virtual infrastructure and production Linux environments.
• Monitor system health, performance, backups, and security compliance.
• Plan and implement security patching and operating system upgrades.
• Maintain accurate server documentation and configuration records.
• Support production releases, infrastructure changes, and disaster recovery activities.
• Rack and stack servers when required.
• Collaborate with infrastructure, application, database, and network teams to resolve complex technical issues.
• Drive automation initiatives to improve operational efficiency.
• Participate in 24x7 on-call support and scheduled maintenance windows.

Desired Soft Skills

• Strong troubleshooting and analytical skills.
• Ability to lead technical discussions and resolve complex production issues.
• Self-motivated with minimal supervision.
• Excellent communication and documentation skills.
• Experience working in enterprise IT environments with high availability requirements.
• Strong understanding of change management and operational best practices.