This role owns clean execution at the endpoint and site layer and fast escalation when a change touches servers, core network, storage, or compliance-scoped systems; it does not own design or server, network, and storage changes, which sit a tier up. You are MSP4's face at a client site: the person end users see, the person who closes the loop when a laptop will not boot, a printer stops talking to the network, or a new hire's workstation needs to be ready before they walk in the door.