Sr Linux Administrator

Job Description

Manage and troubleshoot Linux servers (RHEL, CentOS, Ubuntu, etc.) at an advanced level. Perform kernel tuning, patching, and OS upgrades while ensuring system stability. Implement and maintain high-availability (HA) clusters, load balancing, and failover mechanisms . Automate system administration tasks using Shell scripting, Ansible, or Python . Monitor server performance and resolve CPU, memory, and I/O bottlenecks . Troubleshoot complex system failures, log analysis, and root cause investigations. Manage LVM, RAID, and storage configurations for optimal performance. Configure and secure services such as Apache, Nginx, MySQL, PostgreSQL, and Docker/Kubernetes . Work on identity and access management (LDAP, SSO, PAM configurations). Ensure compliance with security policies and hardening Linux systems (CIS benchmarks, firewall rules, SELinux, etc.). Collaborate with cross-functional teams (networking, DevOps, security, and application teams) to ensure smooth operations. Provide L3 escalation support and mentor junior engineers. Required Skills & Qualifications: 5+ years of hands-on Linux system administration experience. Expertise in troubleshooting complex Linux issues and performance tuning. Strong knowledge of scripting (Bash, Python, or Ansible) for automation. Experience with HA clusters, load balancing (HAProxy, Keepalived), and failover setups . Familiarity with virtualization and cloud platforms (VMware, AWS, Azure, or GCP). Hands-on experience with containerization (Docker, Kubernetes) . Experience with monitoring tools like Prometheus, Grafana, Nagios, or Zabbix. Strong understanding of networking concepts (TCP/IP, DNS, VPNs, Firewalls, etc.) . Security hardening experience (SELinux, AppArmor, iptables, etc.). Strong analytical and problem-solving skills. Good to Have: Red Hat Certified Engineer (RHCE) or equivalent certification. Experience with Infrastructure-as-Code (Terraform, CloudFormation). Knowledge of CI/CD pipelines and DevOps practices.