Systems Administrator - Senior

Senior Systems Administrator

Security Clearance: Secret clearance with IT-I Critical Sensitive / Tier 5 investigation required at proposal submission.
Certification Requirements: CompTIA Security+, Microsoft Azure Administrator Associate (AZ-104), and DoD 8140 baseline certification.

Position Summary

Nationwide IT Services (NIS) is seeking a highly qualified Senior Systems Administrator to support a federal IT application modernization and sustainment program for the Defense Logistics Agency (DLA).

The Senior Systems Administrator will be responsible for managing, maintaining, securing, and optimizing enterprise application infrastructure within a Department of Defense (DoD) environment. This position requires extensive experience administering Windows and Linux servers, Microsoft Azure cloud environments, system configurations, and security controls to ensure system availability, reliability, and performance.

The successful candidate will provide advanced technical support, perform system maintenance and vulnerability remediation, troubleshoot complex infrastructure issues, and support ongoing modernization initiatives.

This position is contingent upon contract award and funding. The work location is off-site.

• Administer, maintain, and optimize Windows Server and Red Hat Enterprise Linux (RHEL) systems within Microsoft Azure environments.
• Monitor enterprise application infrastructure, including virtual machines, databases, web servers, application servers, and file servers to ensure availability and performance.
• Perform software installation, system configuration, routine maintenance, patch management, upgrades, and troubleshooting.
• Monitor system health, analyze performance metrics, identify bottlenecks, and implement corrective actions to improve system reliability.
• Conduct vulnerability remediation, apply security patches, and maintain compliance with DoD cybersecurity policies and applicable Security Technical Implementation Guides (STIGs).
• Support Microsoft Azure cloud administration, including virtual machine management, resource optimization, system monitoring, and infrastructure configuration.
• Coordinate with government technical teams to resolve infrastructure, networking, system configuration, and application performance issues.
• Support system architecture assessments, infrastructure right-sizing, and resource allocation to improve operational efficiency and manage costs.
• Monitor hardware and software lifecycle requirements, identify end-of-life or end-of-support risks, and support migration to modernized environments.
• Maintain SSL/TLS certificates and government-issued security certificates to ensure secure and uninterrupted application operations.
• Support backup verification, disaster recovery planning, system restoration, and continuity of operations activities.
• Assist with migration of development and testing environments to government-approved Microsoft Azure environments.
• Utilize enterprise monitoring and troubleshooting tools to identify system issues, analyze logs, and support incident resolution.
• Support vulnerability assessments, security scans, and remediation activities using government-approved security tools.
• Maintain accurate technical documentation, system configurations, operational procedures, and infrastructure records.
• Coordinate configuration management, change requests, and production deployments in accordance with established government procedures.
• Provide advanced technical support for escalated system incidents, outages, and application infrastructure issues.

• Minimum of 10 years of specialized application systems administration experience, including at least four years of hands‑on software installation, configuration,…