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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Classified Senior Windows Systems Administrator - **Company:** The Johns Hopkins University Applied Physics Laboratory LLC - **Location:** North Laurel, MD, United States - **Experience:** Expert - **Salary:** $100,000.0 - $245,000.0 - **Contract:** Permanent contract - **Skills:** Microsoft Windows, Active Directory, User Authentication, Backup Devices, Configuration Management, Software Documentation, CompTIA Security+, Databases, Directed Acyclic Graph (Directed Graphs), Dynamic Host Configuration Protocol, Disaster Recovery, Domain Name System (DNS), Multi-Factor Authentication, Microsoft Exchange Server, Monitoring of Systems, Hyper-V, System Center Configuration Manager, Windows Servers, Public Key Infrastructure, Windows PowerShell, RSA (Cryptosystem), Service Pack, Systems Architecture, Virtualization Technology, VMware VSphere, Software Vulnerability Management, System Availability, Facebook Flow, Software Troubleshooting, Reliability of Systems, Storage Technologies, Information Technology, Patch Management, RSA SecurID, Wsus - **Published:** November 5, 2026 - **Apply:** https://diversityjobs.com/career/18844742/Classified-Senior-Windows-Systems-Administrator-Maryland-Laurel ## About the Role As a member of our team, you will administer and modernize enterprise Windows environments, maintain essential infrastructure services, and ensure systems meet operational and cybersecurity requirements. We are looking for a self-motivated professional who demonstrates strong technical expertise, takes initiative, communicates effectively, and can independently manage complex infrastructure challenges while collaborating across technical teams., * Have ten (10) or more years of direct, hands-on experience administering Windows Server infrastructure in an enterprise production environment. * Have a minimum of five (5) years of hands-on experience administering on-premises Microsoft Exchange Server in a production environment, with demonstrated responsibility for independently managing system administration, maintenance, troubleshooting, upgrades, and operational reliability. * Have advanced technical experience with Windows Server, Active Directory, Group Policy, DNS, DHCP, enterprise authentication services, and virtualization technologies, including VMware vSphere or Hyper-V. * Have experience administering enterprise multifactor authentication (MFA) solutions, including authentication integration, access policies, and troubleshooting. * Are proficient in PowerShell scripting and automation, with experience performing operating system upgrades, enterprise patch management using technologies such as WSUS or Microsoft Configuration Manager (SCCM/MECM), system monitoring, backup, and disaster recovery. * Have experience implementing DISA STIG requirements, remediating vulnerabilities, and supporting cybersecurity compliance activities. * Hold an active CompTIA Security+ certification or another certification satisfying applicable DoD 8140 qualification requirements. * Demonstrate strong initiative, technical ownership, and the ability to independently identify problems, develop solutions, prioritize competing requirements, and execute complex technical initiatives with minimal supervision. * Possess excellent oral and written communication skills, including the ability to clearly communicate complex technical information, develop comprehensive documentation, and collaborate effectively with technical teams, customers, and leadership. * Hold an active TS/SCI+poly security clearance. If selected, you will be subject to a government security clearance investigation and must meet the requirements for access to classified information. Eligibility requirements include U.S. citizenship. You'll go above and beyond our minimum requirements if you... * Have a bachelor's degree in Computer Science, Information Technology, Engineering, or a related technical field. * Have experience administering enterprise infrastructure in classified, isolated, or disconnected environments. * Have advanced experience with Microsoft Exchange Server, including database availability groups (DAGs), mail flow, transport services, high availability, and complex migrations. * Have hands-on experience administering RSA SecurID and RSA Authentication Manager, including enterprise MFA integrations, token administration, and advanced authentication troubleshooting. * Have experience with enterprise PKI, storage technologies, infrastructure resiliency, and high-availability architectures. * Hold additional technical or cybersecurity certifications, such as Microsoft certifications, CISSP, or CompTIA SecurityX. ## Description Are you an experienced Windows Systems Administrator who enjoys solving complex technical challenges and supporting mission-critical infrastructure? Do you thrive in an environment where you can take ownership of enterprise systems, lead technical initiatives, and contribute to the security and reliability of critical IT services?, * Administer and maintain enterprise Windows infrastructure, including Windows Server, Active Directory, Group Policy, DNS, DHCP, Public Key Infrastructure (PKI), virtualization platforms (VMware vSphere and Hyper-V), and supporting services to ensure system reliability, availability, and performance. * Serve as a primary technical resource for on-premises Microsoft Exchange Server, responsible for administration, maintenance, troubleshooting, system upgrades, and ensuring the reliability and availability of enterprise messaging services. * Manage enterprise authentication and security services, including RSA SecurID multifactor authentication (MFA), authentication policies, token administration, security patching, vulnerability remediation, and DISA Security Technical Implementation Guide (STIG) compliance. * Lead infrastructure engineering and modernization initiatives, including system architecture and design, operating system and Exchange Server migrations, infrastructure upgrades, and implementation of solutions that improve reliability, performance, and security. * Troubleshoot complex technical issues and improve operational efficiency through root cause analysis, system monitoring, PowerShell automation, enterprise patch management, and development of effective technical solutions. * Support cybersecurity compliance and operational readiness, including Risk Management Framework (RMF) requirements, continuous monitoring, system documentation, standard operating procedures (SOPs), and backup and recovery processes. * Provide technical leadership and collaboration, independently managing technical initiatives, mentoring other administrators, and communicating effectively with cybersecurity teams, technical stakeholders, and leadership. * Support mission-critical operations outside normal business hours, including evenings, weekends, and holidays, as needed to perform scheduled maintenance, security patching, system upgrades, and respond to outages or other critical operational requirements.