Senior Redhat Linux Administrator

Position Description: Senior Redhat Linux Administrator to support the client's Internet support services in Woodlawn, MD. This role provides advanced engineering, operations, and automation support across Red Hat Enterprise Linux (RHEL), multi-cloud ACI environments (AWS, Azure, GCP), container platforms (OpenShift, Kubernetes, EKS), and DIS enterprise services including Internet Messaging, DNS, and security-driven infrastructure operations. The ideal candidate brings deep expertise in RHEL, automation at scale (Ansible/Tower/AAP, Satellite), cloud infrastructure, container orchestration, and federal security compliance requirements. This position is located in Woodlawn, MD Your future duties and responsibilities: 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 GCP-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. Required qualifications to be successful in this role: 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 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 Desired qualifications/non-essential skills required: Experience supporting DIS mission-critical systems. Experience with CI/CD tooling (Jenkins) and Git/Bitbucket. Federal government experience. Strong ability to operate independently and document complex processes. Experience with SAN technologies, backup/restore tools, and hybrid messaging integrations. Ability to collaborate with cross-functional technical teams. Adept at working independently, but also in a team environment Demonstrated experience delivering technology solutions in a fast-paced, deadline driven enterprise environment Excellent understanding of change management, testing requirements, techniques, and tools to ensure high availability of systems Experience developing and maintaining Red Hat Ansible Playbooks