- Manager Enterprise Telephony & Contact Center Engineering (f/m/d) IT / Essen Headoffice / Hybrid / Vollzeit / iSE02612 Contract titel: Manager Solution Integration Welcome to ista At ista, we support property owners and managers in making their buildings fit for the future and kind to the planet. That includes tracking and billing energy consumption in a way that's easy to grasp, to help save energy and cut CO₂ emissions. With over 6,300...