Senior System Administrator

Job summary

The Senior Systems Administrator leads the design, administration, automation, security, and continuous improvement of enterprise Linux infrastructure across on-premises and AWS environments. Responsibilities include supporting Red Hat Enterprise Linux and Amazon Linux production systems, managing upgrades and patching, remediating vulnerabilities, troubleshooting complex incidents, and developing Ansible and Bash automation. The role also establishes platform standards, maintains operational documentation, and collaborates with cloud, application, networking, database, and security teams supporting critical infrastructure.

Qualifications

• Strong hands-on experience administering enterprise production Linux server platforms
• Advanced experience with Red Hat Enterprise Linux and Amazon Linux
• Expert knowledge of Linux troubleshooting, including kernel operations, boot processes, networking, storage, systemd, SSH, PAM, authentication, and performance
• Experience with enterprise patch management, operating system upgrades, vulnerability remediation, and security advisories
• Advanced Ansible experience and strong Bash scripting and automation skills
• Significant experience supporting Linux workloads in AWS, including EC2, EBS, AMIs, launch templates, user data, and Systems Manager
• Working knowledge of AWS networking, VPCs, routing, subnets, and security groups
• Knowledge of Linux security best practices, TCP/IP, DNS, routing, firewall concepts, and service connectivity troubleshooting
• Strong problem-solving, communication, documentation, and independent judgment
• Preferred experience in energy or critical infrastructure, hybrid cloud, IaC, containers, DevOps, regulated environments, and CIS or NIST security frameworks
• Preferred experience leading technical projects, developing infrastructure standards, and mentoring engineers

Responsibilities

• Design, administer, automate, secure, and continuously improve enterprise Linux infrastructure across on-premises and AWS environments
• Support production Red Hat Enterprise Linux and Amazon Linux systems and ensure reliability, availability, performance, and security
• Manage operating system lifecycle activities, including upgrades, kernel and package management, and platform standardization
• Lead Linux patch management, maintenance planning, vulnerability remediation, and patch-related troubleshooting
• Develop Ansible playbooks, roles, inventories, and automation frameworks, and use Bash to reduce manual operations
• Administer AWS Linux workloads and services including EC2, EBS, AMIs, launch templates, user-data scripts, and Systems Manager
• Troubleshoot complex Linux, networking, storage, authentication, and performance issues and lead root-cause investigations
• Maintain technical standards, procedures, runbooks, build documentation, and knowledge repositories
• Collaborate with application, database, cloud, networking, and security teams; mentor team members and contribute to infrastructure strategy

Skills

Certifications

Degrees

Industry

Relocation