GroupM Germany GmbH is a well-established internet service in the marketing and IT business.
At this point, what the company is primarily hunting for is Internet Marketing, Marketing, and Web Analytics professionals in Düsseldorf, Munich and Vienna. We count 7 vacancies at GroupM Germany GmbH for job titles such as "Junior Controller (m/w/d)" and "Social Media Consultant (m/w/d)".
Check out their social profile on Twitter - or if you are looking for a more impartial description, try their Wikipedia article. If you are interested in the company's vacancies, their careers page is a great starting point.