Vacatio Robot OS is the world's first operating system that lets multi-vendor service robots run a hotel together — safely, alongside guests and staff. Hotels face chronic labor shortages and are adopting cleaning, delivery, and guidance robots, but each vendor's robot works in isolation, so deployments stall at single-robot pilots and overwhelm non-technical staff. Vacatio fuses reservations, rooms, guests, robots, and facilities into one live operating map, then automatically assigns, sequences, and de-conflicts every task — clearing corridor conflicts within a design target of ~85ms with built-in safety checks and automatic recovery. Built on live operating data from a 3,000-room base on its hotel property-management system (PMS), it turns isolated single-robot automation into building-wide autonomous operation, letting one operator run an entire robot fleet by voice.