The Onsite Security Engineer is responsible for managing and supporting enterprise security technologies at the client location. This includes Endpoint Detection & Response (EDR), Extended Detection & Response (XDR), Microsoft Security stack, network security controls, cloud security, and secure internet gateways. The role requires hands‑on expertise in Microsoft Defender ecosystem, Azure security, Cisco firewalls, and automation using PowerShell, ensuring proactive threat detection, response, and compliance with security standards.