Linux/Ubuntu L3 System Administrator / Engineer

Role Overview

• The L3 Linux/Ubuntu Administrator is responsible for managing and maintaining missioncritical Linux infrastructure
• This includes advanced troubleshooting, performance tuning, automation, and ensuring system security and availability
• The role requires deep expertise in Linux (especially Ubuntu) and the ability to resolve complex issues independently

Key Responsibilities

• Manage and maintain Linux server infrastructure (Ubuntu and other distributions)
• Ensure system performance, availability, and security across production and nonproduction environments
• Provide advanced troubleshooting and resolve complex server, network, and application issues
• Perform kernel upgrades, OS patching, package management, and system hardening
• Implement system enhancements and optimizations to improve efficiency
• Automate repetitive tasks using Bash, Python, or Ansible
• Configure and manage LVM, RAID, iSCSI, and networking concepts
• Monitor system performance using enterprise tools like Nagios, Zabbix, or Prometheus
• Conduct root cause analysis for critical incidents and lead resolution efforts
• Collaborate with crossfunctional IT teams to ensure seamless integration of Linux systems
• Maintain documentation for system configurations, procedures, and troubleshooting guides

Required Skills & Experience

• 7-12 years of experience in Linux system administration (Ubuntu, Red Hat, CentOS, Oracle Linux)
• Strong knowledge of Ubuntu server management and enterprise Linux environments
• Expertise in performance tuning, security hardening, and troubleshooting
• Experience with virtualization (KVM, VMware), containers (Docker, Kubernetes)
• Familiarity with cloud platforms (AWS, Azure, GCP) for Linux workloads
• Proficiency in scripting and automation (Bash, Python, Ansible)
• Solid understanding of networking protocols, firewalls, and load balancers
• Ability to work independently and lead critical incident resolution

Preferred Qualifications

• Certifications: RHCE, LFCS, LPIC3, Ubuntu Professional
• Experience with CI/CD pipelines and DevOps practices
• Exposure to configuration management tools (Puppet, Chef, SaltStack)

Skills:

• Incident Management
• Linux
• Ubuntu