Linux Administrator

Job Summary We are seeking an experienced Linux Administrator to manage, maintain, secure, and optimize our Red Hat Enterprise Linux (RHEL) infrastructure. The ideal candidate will have strong Linux administration skills, experience with enterprise networking services, and a solid understanding of automation, security, and identity integration. This role requires someone who can independently troubleshoot complex issues, implement best practices, and support a highly available production environment. 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 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. Support virtualization platforms and cloud-hosted Linux environments. 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. What We're Looking For We’re looking for a hands‑on Linux administrator who enjoys solving infrastructure challenges, improving automation, and implementing secure enterprise solutions. The ideal candidate has experience modernizing Linux environments, understands enterprise identity management, and is comfortable leading initiatives such as migrating from ISC DHCP to Kea DHCP and improving Active Directory integration to enable secure, automated user lifecycle management. EEO & Diversity Statement Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability, or protected veteran status. Diversity and inclusion make us all better. #J-18808-Ljbffr