This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Sr. System Administrator (Windows) based in United States. This role is responsible for managing and enhancing a large-scale Windows infrastructure environment supporting critical business operations.The position focuses on Windows Server administration, Active Directory management, automation, security, and infrastructure reliability.You will serve as a technical expert, helping design, troubleshoot, and improve enterprise systems across on-premises and cloud environments.The role offers the opportunity to influence infrastructure modernization, operational efficiency, and platform stability.Working closely with cross-functional infrastructure teams, you will contribute to resilient, secure, and scalable technology solutions.This position is ideal for an experienced systems professional who enjoys solving complex technical challenges and driving continuous improvement.