Linux/Ubuntu L3 System Administrator / Engineer

Position Description
Job Title 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 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 712 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) Your future duties and responsibilities Required Qualifications To Be Successful In This Role Together, as owners, lets turn meaningful insights into action Life at CGI is rooted in ownership, teamwork, respect and belonging Here, youll reach your full potential because You are invited to be an owner from day 1 as we work together to bring our Dream to life Thats why we call ourselves CGI Partners rather than employees We benefit from our collective success and actively shape our companys strategy and direction Your work creates value Youll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise Youll shape your career by joining a company built to grow and last Youll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons Come join our teamone of the largest IT and business consulting services firms in the world