After working as an assistant at the University of Maribor, where he worked as a researcher at the eCommerce laboratory, Grum began working at the internationally renowned IBM enterprise. There he was responsible for a range of activities in the fields of innovation, education and university programs and was involved in establishing the IBM Cloud for developers system as well as establishing the startup ecosystem around the IBM Cloud solution.

In 2015, Grum co-founded the internationally acclaimed ABC Accelerator, where he has been the Director since 2018. Within the three-month accelerator program, startups are assisted in the initial stages, both in the form of consulting and financially.