RedHat Linux Systems Administrator (Sr.)

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. Quadrant is an affirmative action/equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, status as a protected veteran, or status as an individual with a disability. Healthcare benefits are offered to all eligible employees according to compliance mandated by the Affordable Care Act .

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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. 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. Current Linux , Security , CySA , CCNA Security, GSEC, GICSP, SSCP