Linux System Administrator

Key Responsibilities

• Administer, configure, and maintain Linux environments including RHEL, CentOS, Ubuntu, and Debian in production environments.
• Perform OS installation, patching, kernel upgrades, package management, and ensure system availability, performance, and reliability.
• Manage user accounts, permissions, authentication (LDAP/Active Directory/PAM), system services, storage (LVM, NFS/CIFS), and backup/restore operations.
• Configure and troubleshoot networking components including TCP/IP, DNS, DHCP, VLANs, bonding, routing, firewall (iptables/firewalld), and connectivity issues.
• Monitor infrastructure using tools such as Nagios, Zabbix, Prometheus, Grafana, and proactively resolve performance, capacity, and availability issues.
• Troubleshoot complex Linux system, application, storage, and network issues using logs, performance analysis, and advanced diagnostic tools to perform root cause analysis (RCA).
• Implement and maintain Linux security hardening, vulnerability remediation, SELinux/AppArmor policies, SSL/TLS certificates, and compliance with security standards.
• Automate operational tasks using Shell (Bash), Ansible, and Infrastructure-as-Code tools such as Terraform or Puppet to improve operational efficiency.
• Design, implement, and support high-availability, disaster recovery, virtualization, containerized (Docker/Kubernetes), and hybrid cloud (AWS/Azure/GCP) Linux infrastructure.
• Optimize system performance through capacity planning, kernel tuning, resource optimization, and infrastructure performance engineering.
• Develop and maintain technical documentation, SOPs, runbooks, architecture documents, and knowledge base articles.
• Provide technical leadership by handling L2/L3 escalations, mentoring junior engineers, participating in on-call support, and collaborating with cross-functional teams, vendors, and stakeholders to deliver reliable infrastructure solutions.

Required Qualifications

• 3–8 years of hands-on Linux administration in a production environment
• Strong proficiency with at least two major distros (RHEL/CentOS and Ubuntu preferred)
• Solid understanding of Linux internals: process management, kernel tuning, boot sequence
• Experience with LVM, RAID, and storage management
• Working knowledge of TCP/IP networking, DNS, and firewall configuration
• Scripting skills in Bash; familiarity with Python is a plus
• Experience with at least one configuration management tool (Ansible, Puppet, Chef)
• Ability to work under pressure and manage multiple priorities simultaneously

Preferred Qualifications

• RHCSA (Red Hat Certified System Administrator) or equivalent certification
• Experience with containerization (Docker, Podman) and basic Kubernetes knowledge
• Familiarity with cloud platforms (AWS, Azure, or GCP) and hybrid infrastructure
• Experience with CI/CD pipelines and DevOps tooling (Jenkins, GitLab CI)
• Knowledge of ITIL processes and ticketing systems (ServiceNow, Jira)

Skills & Competencies

• Strong analytical and problem-solving skills
• Clear verbal and written communication — able to explain technical issues to non-technical stakeholders
• Team player with a proactive, ownership-driven mindset
• Attention to detail and a commitment to documentation and process adherence