Senior Windows Systems Administrator

Responsibilities

• Windows Server Lifecycle Management: Deploy, configure, patch, and maintain Windows Server (2019/2022) operating systems across physical, virtual, and cloud architectures . Monitor system performance, resource utilization, and event logs to proactively identify and resolve infrastructure issues.
• Active Directory & Identity Management: Execute advanced Active Directory administration, including forest/domain management, Group Policy Object (GPO) engineering, replication topology troubleshooting, and critical security audits. Serve as a primary escalation point for complex AD duties.
• Hybrid Cloud Identity Integration: Manage, configure, and troubleshoot identity synchronization between on-premises Active Directory and Microsoft Entra ID.
• Federation & Single Sign-On (SSO): Architect, maintain, and secure Active Directory Federation Services (ADFS) to deliver seamless authentication across legacy internal services and modern SaaS endpoints.
• Enterprise Configuration & Systems Management: Engineer, maintain, and troubleshoot Microsoft Configuration Manager (MECM/SCCM) infrastructure. Own enterprise-wide software distribution, Operating System Deployment (OSD) task sequences, configuration items, and automated infrastructure patch management workflows.
• Web & Application Server Administration: Oversee the configuration, performance tuning, and security hardening of Internet Information Services (IIS) hosting critical web applications. Manage SSL/TLS certificate lifecycles.
• Virtualization Infrastructure: Administer on-premises Hyper-V clustered environments, maximizing compute efficiency, managing virtual networking, and ensuring reliable storage allocations.
• Database Infrastructure Support: Provide essential secondary infrastructure support for Microsoft SQL Server, including environment provisioning, health monitoring, and ensuring robust redundancy and scalability .
• Multi-Cloud Administration: Bridge the gap between local enterprise services and cloud infrastructure by managing, provisioning, and maintaining target environments within AWS and GCP.
• Backup, Recovery & Security: Design and execute business continuity and disaster recovery plans. Comply with Zero-Trust access methodologies, robust vulnerability patch management, and maintain rigorous baseline technical compliance.

Required Qualifications

• Experience Level: 5+ years of dedicated experience in Windows Systems Administration, with at least 2-3 years in a senior or lead capacity.
• Active Directory Expertise: Proven history resolving complex AD anomalies (replication topology issues, schema extensions, deep-dive troubleshooting, and multiplatform integration).
• Hybrid & Cloud Proficiency: Direct operational experience maintaining infrastructure footprints inside both AWS and GCP, including secure cross-platform networking back to on-premises resources.
• Scripting & Automation: Strong proficiency utilizing PowerShell to replace manual administrative workflows, manage bulk configurations, and extract system metrics.
• Soft Skills: Exceptional analytical thinking, problem-solving under pressure, and cross-team communication skills.

Technical Environment Matrix

• Operating Systems: Windows Server 2019 / 2022.
• Core Identity & Auth: Active Directory (AD DS), Microsoft Entra ID, ADFS, Kerberos, NTLM, SAML.
• Systems Management & Distribution: Microsoft Configuration Manager (MECM / SCCM), WSUS, Group Policy (GPO).
• Microsoft Ecosystem: IIS, SQL Server (2019/2022), Hyper-V Failover Clusters, System Center Virtual Machine Manager, Microsoft Configuration Manager
• Cloud Platforms: Amazon Web Services, Google Cloud Platform, and Microsoft Azure
• Automation: Advanced PowerShell scripting for infrastructure automation, bulk object provisioning, and data harvesting.