Senior Level - Redhat Linux Systems Admin

About the Role

The Senior Linux Systems Administrator provides Tier II/III administration and operational support for Red Hat Enterprise Linux (RHEL) and UNIX server environments supporting JSSC Enterprise Services under JC32. Based primarily at the Pentagon, this position supports GCCS-J and JPES mission environments across production, test, and development systems.

Responsibilities

• Administer and maintain Red Hat Enterprise Linux and UNIX servers across production, test, and development environments.
• Perform account administration, operating system maintenance, resource monitoring, log analysis, performance tuning, storage support, and system troubleshooting.
• Engineer, configure, and sustain Linux server hardware, operating systems, and supporting software for mission-critical environments.
• Test and deploy operating system, COTS, GOTS, security, and IAVA-related patches through approved change-control processes.
• Apply DISA STIGs and support vulnerability identification, remediation, and security compliance activities.
• Support backup and recovery coordination, disaster recovery, and continuity-of-operations requirements.
• Monitor system health, availability, performance, capacity, and operational trends.
• Test hardware upgrades, software upgrades, patches, IAVAs, and configuration changes in non-production environments before implementation.
• Perform approved maintenance, repairs, and upgrades during scheduled non-business hours.
• Document, track, troubleshoot, and resolve incidents through the assigned ticketing system.
• Support ITIL-aligned incident, problem, change, and configuration management processes.
• Develop and maintain configurations, SOPs, implementation procedures, maintenance records, test plans, test reports, operational logs, and runbooks.
• Coordinate with government leads, system administrators, database administrators, application teams, cybersecurity personnel, and external support organizations.
• Recommend improvements to system administration and IT operations based on industry and ITIL best practices.

Requirements

• Active Top Secret security clearance with eligibility for SIPRNet access.
• U.S. citizenship.
• At least 10 years of relevant IT experience providing technical support and solutions for complex systems and operational environments.
• Advanced experience administering UNIX/Linux servers, preferably Red Hat Enterprise Linux.
• Expertise in systems administration, systems architecture, systems integration, network systems management, or a related technical discipline.
• Current certification meeting DoD IAT Level II requirements, such as Security+, CySA+, GSEC, GICSP, SSCP, CCNA Security, or another approved certification.
• Ability to work independently, exercise sound technical judgment, and develop solutions to complex IT problems.
• Ability to support 12x5 operations and participate in a 24/7 on-call rotation.
• Ability to respond within two hours of notification when on call.
• Ability to relocate to Site-R within 12 hours for COOP exercises or real-world contingencies when designated as an Emergency Relocation Group member.
• Ability to perform planned maintenance, repairs, and upgrades outside normal business hours when required.

Qualifications

• Current Linux+, Security+, CySA+, CCNA Security, GSEC, GICSP, SSCP, or other certification meeting DoD IAT Level II requirements.

Preferred Qualifications

• Experience administering RHEL in classified Department of Defense operational environments.
• Experience supporting DISA, GCCS-J, JPES, or comparable command-and-control mission systems.
• Experience with Linux shell scripting, automation, and system administration tools.
• Experience applying DISA STIGs, IAVAs, security patches, and vulnerability remediation measures.
• Experience with VMware or another enterprise virtualization platform.
• Experience with enterprise monitoring, logging, performance analysis, and capacity-planning tools.
• Experience with backup and recovery, storage coordination, disaster recovery, and COOP support.
• Experience supporting ITIL-based incident, problem, change, and configuration management.
• Experience developing SOPs, runbooks, technical documentation, and system configuration records.