My client is a top-tier multinational financial services institution with a massive global footprint. They are currently looking for a senior-level infrastructure Subject Matter Expert to take technical ownership of their core Active Directory (AD), Windows and Identity ecosystems. This is a highly technical, hands-on role focusing on mission-critical architecture, high availability, and Tier-0 security in a complex enterprise environment. The Mandate: Oversee, optimize, and engineer the enterprise Windows Server landscape, ensuring maximum performance and uptime. Drive the architecture, health, and support of complex Active Directory environments, including forest/domain design, OU structures, GPOs, and replication topologies. Lead the integration of hybrid identity solutions, seamlessly bridging on-premise AD with Microsoft Entra ID and M365. Architect and maintain secure authentication, federation platforms, and Single Sign-On (SSO) utilizing ADFS. Secure, design, and govern Tier-0 ...