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