Dimension Data is a well-established service provider mainly active in the telecommunications, IT, and hosting verticals.
For the time being, what the company is primarily recruiting for is Data Centers, Computer Network Security, and Computer Networks professionals in Vienna and Johannesburg. Dimension Data currently has 10 job offers for jobs like "Assistent/in (m/w)" and "Solution Architect Network Infrastructure (m/w)".
More details about Dimension Data is available on the web, for example on Wikipedia and Twitter. A resource not to neglect is the company's careers page with more details about job offers and career prospects.