Rocket Internet CTO moves to plug holes by Kate Rodriguez in Insiders 10 Oct 2016 Rocket Internet chief technology officer (CTO) Christian von Hardenberg took over the CTO role at Delivery Hero and his place was taken by Ronny Rentner, a former senior vice president for engineering at the Berlin-based incubator. This article is only available to AIM Group clients. Please subscribe now or log in to view. Share Christian von Hardenbergdelivery herogermanyRocket InternetRonny RentnerScott Fletcher Kate Rodriguez Kate Rodriguez covers the German market for AIM Group. She is a freelance business writer with an extensive background in public policy, business consulting and marketing. Originally from the U.S., Kate is now based in Munich.