System Administrator

System Administrator Location: Fort Belvoir, VA Security Clearance: Active Secret Security Clearance Position Overview Nationwide IT Services (NIS) is seeking an experienced System Administrator to support a Department of Defense customer at Fort Belvoir, VA. This position is responsible for ensuring the reliability, security, and performance of enterprise servers, network infrastructure, and mission-critical systems across multiple operational locations. The ideal candidate will have extensive experience administering Windows and/or Linux environments, maintaining secure enterprise networks, automating system administration tasks, and providing advanced technical support. This role works closely with network engineers, cybersecurity personnel, and other IT professionals to deliver a stable, highly available infrastructure that supports critical DoD operations. Key Responsibilities Install, configure, administer, and maintain enterprise servers, operating systems, and network software. Plan, implement, and optimize system configurations to maximize performance, reliability, and availability. Support server installations, upgrades, migrations, and maintenance activities across multiple locations. Monitor system health, troubleshoot performance issues, and resolve complex technical problems. Manage application networking, load balancing, and fault-tolerant system configurations. Perform vulnerability management activities, including identifying, analyzing, and remediating security vulnerabilities. Conduct system capacity planning and performance analysis, recommending hardware and software upgrades as needed. Develop and maintain automation scripts and tools to improve operational efficiency and standardize administrative processes. Create and maintain system administration procedures, technical documentation, and operational standards. Provide technical leadership and guidance to junior system administrators and support personnel. Support end users by resolving advanced software, hardware, and connectivity issues while providing technical guidance and training. Collaborate with network, cybersecurity, and application teams to ensure secure, reliable enterprise operations. Support infrastructure, modernization initiatives and evolving mission requirements. Required Qualifications Bachelor’s degree in information technology, Computer Science, Engineering, or a related technical discipline. Seven (7) to ten (10) years of experience administering enterprise Windows and/or Linux server environments. Active Secret Security Clearance. Current CompTIA Security+ certification (preferred), or Network+ or Certified Network Defender (CND) certification. Experience administering enterprise servers, networking, and operating system environments. Experience performing vulnerability management, system hardening, and security best practices. Strong troubleshooting and analytical skills with the ability to resolve complex infrastructure issues. Preferred Qualifications Experience supporting Department of Defense or other Federal Government enterprise environments. Experience with enterprise networking, load balancing, and high-availability system architectures. Knowledge of virtualization technologies, enterprise storage, and backup solutions. Experience with scripting and automation tools such as PowerShell, Bash, or Python. Familiarity with Microsoft Active Directory, Group Policy, DNS, DHCP, and enterprise server technologies. Experience supporting data center operations and infrastructure modernization efforts. Excellent communication skills with the ability to work effectively across cross-functional technical teams. Why Nationwide IT Services? Nationwide IT Services is committed to delivering innovative technology solutions that support our nation's critical missions. As part of our team, you'll work alongside experienced IT professionals supporting secure enterprise infrastructure for the Department of Defense. We offer a collaborative environment, opportunities for professional growth, and the chance to make a meaningful impact supporting our nation's warfighters. Salary range: $78,000 to $110,000 annually The salary range is a general guideline. We consider several factors when determining base salary offers, including the position's scope and responsibilities, the candidate's experience, education, and skills, and current market conditions.