Senior Windows Systems Administrator - TS/SCI Poly

Johns Hopkins Applied Physics Laboratory; Laurel (MD); On-site; USD 100,000 - 245,000; Full time

Job summary

Johns Hopkins Applied Physics Laboratory seeks a Senior Windows Systems Administrator to own enterprise Windows environments, AD, and Exchange. You will lead upgrades, security hardening, and automation while supporting mission-critical systems. Expect after-hours support and collaboration across cybersecurity teams.

The role requires 10+ years in Windows Server in enterprise settings, 5+ years with Exchange, and TS/SCI+poly clearance. Strong communication and initiative are essential.

Qualifications

• 10+ years of hands-on Windows Server administration in an enterprise production environment.
• 5+ years of hands-on Exchange Server administration with operational reliability.
• Advanced experience with Windows Server, AD, DNS/DHCP, and virtualization (VMware/Hyper‑V).
• Experience administering MFA solutions and security policies.
• Proficient in PowerShell scripting and enterprise patch management (WSUS/MECM).
• Experience implementing DISA STIG requirements and cybersecurity compliance.

Responsibilities

• Administer and maintain enterprise Windows infrastructure and services.
• Manage on‑prem Exchange Server; ensure reliability and availability of messaging.
• Oversee authentication services including MFA and policy enforcement.
• Lead system architecture and modernization, migrations, and upgrades.
• Drive root-cause analysis and automation to boost reliability and efficiency.
• Support RMF, continuous monitoring, SOPs, and backup/recovery processes.
• Provide technical leadership and mentorship across teams; communicate with stakeholders.
• Support after-hours maintenance and outages as needed.

Skills

Windows Server

Active Directory

Exchange Server

PowerShell

MFA (RSA SecurID)

Security clearance TS/SCI+poly

Education

Bachelor's degree in Computer Science or related field

Tools

VMware vSphere

Hyper-V

SCCM/MECM

WSUS

Job description

Johns Hopkins Applied Physics Laboratory seeks a Senior Windows Systems Administrator to own enterprise Windows environments, AD, and Exchange. You will lead upgrades, security hardening, and automation while supporting mission-critical systems. Expect after-hours support and collaboration across cybersecurity teams.

The role requires 10+ years in Windows Server in enterprise settings, 5+ years with Exchange, and TS/SCI+poly clearance. Strong communication and initiative are essential.