Systems Administrator - Senior

Nationwide IT Services•Fairfax, VA

About The Position

Nationwide IT Services (NIS) is seeking a Senior Systems Administrator to support a federal IT application modernization and sustainment program for the Defense Logistics Agency (DLA). The role manages, maintains, secures, and optimizes enterprise application infrastructure in a Department of Defense environment, ensuring system availability, reliability, and performance. The position supports Windows and Linux servers, Microsoft Azure environments, system configurations, and security controls, while providing advanced technical support, system maintenance, vulnerability remediation, and troubleshooting for complex infrastructure issues. It is contingent upon contract award and funding, and the work location is off-site. The role requires a bachelor's degree in a technical discipline, at least 10 years of specialized application systems administration experience, and specified security credentials and clearance. An active Secret clearance and IT-I Critical Sensitive / Tier 5 investigation must be satisfied at proposal submission. Required certifications are CompTIA Security+, Microsoft Azure Administrator Associate (AZ-104), and a DoD 8140 baseline certification. NIS describes itself as a CVE-verified Service-Disabled Veteran-Owned Small Business and an IT and management consulting company. Its mission is to deliver value-added services by leveraging technology, people, and industry best practices to implement innovative solutions through its employees and team members.

Requirements

At least 10 years of specialized application systems administration experience.
At least four years of hands-on software installation, configuration, maintenance, and troubleshooting experience.
CompTIA Security+ certification.
Microsoft Azure Administrator Associate (AZ-104) certification.
DoD 8140 baseline certification.
Experience administering enterprise application infrastructure in complex IT environments.
Experience with Windows and Linux server administration, Microsoft Azure environments, networking, system configurations, and security controls.
Experience performing vulnerability remediation, troubleshooting, patching, and performance optimization.
Bachelor's degree (BA/BS) in a technical discipline.
Active Secret security clearance at proposal submission.
IT-I Critical Sensitive / Tier 5 investigation at proposal submission.

Responsibilities

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, for availability and performance.
Perform software installation, system configuration, routine maintenance, patch management, upgrades, and troubleshooting.
Monitor system health and performance metrics, identify bottlenecks, and implement corrective actions to improve reliability.
Remediate vulnerabilities, apply security patches, and maintain compliance with DoD cybersecurity policies and applicable Security Technical Implementation Guides (STIGs).
Administer Microsoft Azure cloud resources, including virtual machines, 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 for 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.
Use 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 technical documentation, system configurations, operational procedures, and infrastructure records.
Coordinate configuration management, change requests, and production deployments under established government procedures.
Provide advanced technical support for escalated system incidents, outages, and application infrastructure issues.