Link Solutions is seeking a Windows System Administrator (Senior-Level) to join our team at Adelphi, MD.Must be a U.S. CitizenActive Top Secret Clearance requiredIAT Level II Certification equivalent or higherNon-remote (relocation assistance available)The Windows System Administrator will support mission-critical information systems at the Army Research Laboratory (ARL). In this role, you will be responsible for the administration, security, maintenance, and optimization of Windows-based infrastructure supporting a globally distributed enterprise environment. You will work closely with IT, Cybersecurity, and operational teams to ensure the availability, performance, and security of systems supporting research and national defense initiatives.This position offers the opportunity to work with advanced Microsoft technologies, enterprise-scale infrastructure, cybersecurity frameworks, and Department of Defense systems while directly contributing to innovative research and critical national security missions.Job Responsibilities:Administer, maintain, and optimize Windows Server operating systems in enterprise and classified environments.Manage and support Microsoft Active Directory, Group Policy Objects (GPOs), DNS, DHCP, and enterprise authentication services.Administer Microsoft Endpoint Configuration Manager (MECM/SCCM) and endpoint management solutions.Install, configure, maintain, and secure Windows operating systems, server platforms, and enterprise applications.Develop and maintain PowerShell scripts to automate system administration tasks and improve operational efficiency.Perform patch management, system updates, and software deployments in accordance with DoD and cybersecurity requirements.Implement and maintain Security Technical Implementation Guides (STIGs) and security hardening standards.Monitor system performance, analyze trends, and troubleshoot hardware, software, and operating system issues.Plan, implement, and test backup and recovery procedures to ensure system resiliency and data integrity.Conduct routine security audits, vulnerability remediation, and compliance assessments.Collaborate with Cybersecurity teams to support vulnerability scanning, risk mitigation, and accreditation efforts.Support incident response activities and assist with troubleshooting complex system and network issues.Maintain detailed technical documentation, system configurations, standard operating procedures, and architecture diagrams.Participate in infrastructure modernization initiatives and technology refresh projects.Work with government stakeholders to identify requirements, improve services, and implement innovative IT solutions.Provide Tier III escalation support and technical leadership for systems administration activities.Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties, or responsibilities that are required of the employee for this job. Compensation Range:$120,000 - $140,000 Full-Time (Monday-Friday)Several factors influence final compensation, including relevant experience, technical expertise, certifications, and education.