Unix Systems Administrator

Job Summary

Responsible for installation, configuration, and support of Unix servers and operating systems in a large retail enterprise environment spanning multiple geographical locations. The role requires 24/7 uptime and includes building logical and virtual partitions, VIO servers, deploying and testing OS LVM, HACMP, mandatory security patching, virus updates, and performance tuning.

• Installs and configures Unix server hardware and software, including logical and virtual servers, IBM/HP Virtualization, Virtual I/O servers, Shared Ethernet Adapters, Virtual SCSI Adapters, AIX, HP‑UX, Linux, and HBSS.
• Assumes a primary role in testing new equipment and has knowledge of AIX pSeries hardware and hardware capable of hosting Linux.
• Troubleshoots Unix server and OS issues; independently uses all available resources (knowledge bases, online resources, etc.) to ensure timely resolution.
• Develops operating procedures for system administration activities such as system monitoring, performance tuning, backup and recovery, server architecture design, and system maintenance.
• Follows established operating procedures and uses support tools for analysis and reporting.
• Executes a planned program of patch and virus update management, including testing, deployment, staging, and documentation. Installs, maintains, and manages AIX NIM, HP Ignite, and HBSS for automated updates; on Linux systems, handles package updates, creates RPMs, and uses YUM to install and update packages.
• Performs regular system maintenance, hardware and software upgrades, server migrations, and performance tuning.
• On Linux servers uses security tools such as SELinux and FAPolicyd to monitor and apply security settings in accordance with DoD, NEXCOM, and industry best practices.
• Utilizes system tools and utilities—including HMC, DLPAR, LVM, NIM, etc.—in performing duties and responsibilities.
• Writes and modifies shell scripts to monitor and automate system administration tasks.
• Actively participates in project planning and assumes a leadership role as needed to ensure the timely and successful completion of projects assigned to the Unix server team.
• Provides technical knowledge and makes recommendations to staff members as required.
• Provides server hardware capacity recommendations.
• Interfaces with Network Engineers, Storage Engineers, Database Administrators, and Application Teams to optimize system use and configuration.
• Provides installation support for new applications and software releases.
• Interfaces with hardware vendors to maintain and schedule equipment repairs in a timely manner.
• Implements installation, configuration, testing, and support of HACMP and other high‑availability technologies as required.
• Provides on‑call 24/7 support on a rotating basis.
• Ensures the rigorous application of Information Security/Information Assurance policies, principles, and practices in the delivery of systems, applications, and services (hardware and software).
• Installs and executes the Secure Readiness Review program and implements system security controls as required; reviews DISA’s Unix Security Technical Implementation Guide (STIG) and checklists for guidance and implements Payment Card Industry standards as mandated on Unix systems.
• Performs other related duties as assigned.

Qualified candidates must be U.S. Citizens and possess, or be required to obtain within six months of appointment, the following certifications:

• IA Certification:
  One of Security+, GIAC Security Essentials (GSEC), Security Certified Network Professional (SCNP), Systems Security Certified Practitioner (SSCP), or a higher‑level credential such as Certified Information Systems Auditor (CISA), Certified Information Systems Security Professional (CISSP), GIAC Security Expert (GSE), or Security Certified Network Architect (SCNA).
• Technical Certification: IBM Certified Specialist and, for NEXCOM, Security+ Technical Certification.

Certifications must be valid (not expired) per the issuers’ policies. Candidates lacking the required certification may be placed in the role on the condition that they obtain the certification within…