The energy transition in Europe induces an increase of the cross-border power flow in order to accommodate wind and PV generation whose production level varies in time and location throughout Europe. Investments in new transmission lines is slow and expensive. As a result, it is needed to make the most of the existing grid to increase the available transfer capacities between countries. PowSyBl Open RAO has been developed for this purpose: as a Remedial Action Optimizer, it optimizes the application of advanced grid management techniques in order to push further the safety limits of the European Power Grid. As it is computationally intensive, it is distributed on a Kubernetes cluster and uses advanced computational tools like Mixed Integer Programming. The presentation will sketch out the architecture of the tool, its main feature, and will end by showing actual use cases.