The need to achieve better and better performance in modern tokamak operations has led to a further development of the plasma shape and position control systems. In particular, extremely elongated plasmas, with high growth rate, are envisaged to reach the required performance for ignition. This request for better performance from the experimentalists side has motivated the development of the new Vertical Stabilization (VS) system at the JET tokamak, which has been proposed within the Plasma Control Upgrade project. Indeed, the main aim of the project is to enhance the capabilities of the plasma vertical position control system, so as to operate with very highly elongated plasma in presence of large perturbations, i.e. large edge localized modes (ELMs). This paper focuses on the new software architecture of the VS system, which relies on a highly configurable real-time framework. Thanks to its flexibility the new VS executes different control algorithms and it schedules the one which maximizes the performance in each plasma phase.