Red Hat Linux Administrator

· Administer, harden, and optimize Red Hat Enterprise Linux (RHEL 7/8/9+) systems for DIS operational environments.

· Build and maintain Ansible/Tower/AAP automation for OS configuration, patching, deployments, network/storage tasks, and cloud infrastructure provisioning.

· Operate and support DIS Internet Messaging platforms (Sendmail/Postfix, SMTP Auth, LDAP sync), including YAML/Ansible-based server provisioning and Splunk log/report automation.

· Manage UNIX/BIND DNS zones, automate zone maintenance, integrate with AD DNS, and ensure compliance with SSA security and change-management processes.

· Support and operate OpenShift, Kubernetes, and Amazon EKS clusters, including deployment of OCI-compliant base images, namespace administration, and containerized application support.

· Provide multi-cloud ACI operations across AWS, Azure, and Google Cloud Platform-compute, storage, networking, AMIs, IAM, encryption, monitoring, and DR/failover design.

· Implement and support security operations including ATO documentation, POA&M tracking, continuous monitoring, vulnerability scanning, intrusion detection, event logging, and incident response.

· Maintain Red Hat Satellite for patching, inventory, and configuration compliance.

· Support virtualization infrastructure including VMware ESXi, vCenter, Horizon/VCF/Aria, Dell/EMC platforms, SAN administration, and backup/restore technologies.

· Produce and maintain engineering documentation, runbooks, system architecture references, and CAPRS/ServiceNow problem and change records.

· Participate in 24x7 on-call rotations, respond to incidents within required SLAs, and support weekend/off-hour maintenance windows.

· 7+ years administering RHEL 7/8/9+ including installation, configuration, optimization, security hardening, and backup/recovery.

· 7+ years troubleshooting performance issues (CPU, memory, I/O, networking).

· 5+ years supporting virtualized environments (VMware ESXi/vCenter/VCF/Aria, KVM).

· 5+ years developing automation using Ansible, Ansible Tower/AAP, Bash, Python, or Perl.

· Expertise in Linux command-line operations and enterprise-level troubleshooting.

· Strong communication and documentation skills.

· 5 years of experience working Virtual Platforms

· 5 years of experience working with Ansible Playbooks

· 3 years of experience with scripting languages for automation tasks and deployments (e.g., Bash Shell and Python)

· Expertise in the Linux command-line environment

· Excellent interpersonal and communication skills

· Deep experience with RHEL tools including Ansible, Satellite, CoreOS, OCI image creation, and automation pipelines.

· Hands-on experience supporting Kubernetes/OpenShift/EKS clusters.

· Advanced experience supporting AWS/Azure/Google Cloud Platform including computer, networking, IAM, encryption, DR/failover.

· Experience managing Internet Messaging (Send mail/Postfix, LDAP, SMTP Auth), Splunk, and YAML/Ansible provisioning.

· Experience supporting UNIX/BIND DNS in multi-platform environments.

· Strong knowledge of federal security requirements including ATO, POA&M, continuous monitoring, vuln scanning, IDS/IPS, and CAPRS/ServiceNow workflows.

· Experience automating cloud, server, network, and storage operations at enterprise scale.