Sr. Linux Administrator

•This position is located in Baltimore, 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 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. 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 . 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 compute, networking, IAM, encryption, DR/failover. . Experience managing Internet Messaging (Sendmail/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.

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