Kobus joined ArcelorMittal South Africa Limited in 1990 and was appointed general manager, corporate finance and treasury in 2003 and then general manager, corporate treasury at Mittal Steel Company N.V in 2004. In February 2006, Kobus was appointed executive director, finance at ArcelorMittal. Kobus joined the Aveng Limited board on 1 September 2010 and will assume the position of financial director on 27 September 2010.