Hessischer Rundfunk is a recognised service provider in the telecommunications vertical. They have their main location in Frankfurt, Germany.
At this moment, Human-Computer Interaction, Usability, and User Interfaces are frequently searched for professions at Hessischer Rundfunk in Frankfurt. See below for a list of 5 vacancies at Hessischer Rundfunk for jobs like "IT-System- und Applikationsadministrator/in" and "Servicetechniker*in Sicherheitstechnik (BMA/SAA/EMA)".
If you need more detailed information about the company, the best resource is their Wikipedia article; but their Twitter profile is worth a look too. If you are interested in the company's vacancies, their careers page is a great starting point.