The L3 Engineer will act as the senior technical escalation point for complex issues and provide advanced support across client IT environments. This role requires deep hands-on expertise in Microsoft 365 (M365) solutions, networking, and firewall technologies, along with a strong ability to troubleshoot high-level technical problems, mentor L2 engineers, and enhance IT service delivery. The ideal candidate has extensive experience working in dynamic IT environments (preferably MSP) and can manage critical technical incidents with minimal disruption to clients.