Linux Administrator

Job Summary

We are seeking an experienced Linux Administrator to manage, maintain, secure, and optimize our Red Hat Enterprise Linux (RHEL) infrastructure.

Key Responsibilities

• Install, configure, administer, and maintain Red Hat Enterprise Linux (RHEL) servers.
• Monitor system performance, availability, and security while proactively identifying and resolving issues.
• Perform system updates, patch management, kernel upgrades, and lifecycle maintenance.
• Configure and troubleshoot core infrastructure services, including DNS, DHCP, and NTP.
• Configure, maintain, and troubleshoot Linux firewall rules using firewalls nftables, or iptables as appropriate.
• Diagnose and resolve SELinux policy and permission issues while maintaining security best practices.
• Administer and support enterprise networking services and ensure reliable system connectivity.
• Deploy, configure, and manage Kea DHCP, including migration planning from ISC DHCP.
• Integrate Microsoft Active Directory with RHEL systems to streamline authentication, authorization, and automated user onboarding and offboarding.
• Manage user accounts, permissions, and access controls using enterprise identity management best practices.
• Automate administrative tasks using Bash, Python, Ansible, or similar automation tools.
• Implement and maintain backup, recovery, and disaster recovery procedures.
• Maintain technical documentation, system standards, and operational procedures.
• Collaborate with infrastructure, security, and application teams to deliver reliable enterprise services.

Required Qualifications

• 5+ years of Linux systems administration experience in enterprise environments.
• Strong experience administering Red Hat Enterprise Linux (RHEL).
• Thorough understanding of DNS, DHCP, and NTP configuration and troubleshooting.
• Experience configuring and troubleshooting Linux firewall rulesets.
• Strong knowledge of SELinux administration, policy management, and troubleshooting.
• Experience deploying and managing Kea DHCP or equivalent enterprise DHCP solutions.
• Experience integrating Microsoft Active Directory with Linux systems using SSSD, Realmd, Kerberos, LDAP, or related technologies.
• Strong scripting and automation skills using Bash, Python, or Ansible.
• Solid understanding of TCP/IP networking, routing, VLANs, DNS, and network troubleshooting.
• Experience with virtualization technologies such as VMware or KVM.
• Excellent analytical, troubleshooting, and documentation skills.

Preferred Qualifications

• RHCSA, RHCE, or other Linux certifications.
• Experience with Docker, Kubernetes, or OpenShift.
• Familiarity with Terraform and Infrastructure as Code.
• Experience with monitoring tools such as Zabbix, Prometheus, Grafana, or Nagios.
• Experience administering Linux systems in AWS, Azure, or Google Cloud.