 Gajewski first came to prominence at IG Farben in 1925 when he was appointed assistant to Carl Bosch and a director of the company in 1925.His career at the company was concentrated on photographic products, with Gajewski appointed technical director of Agfa in 1928 and head of IG Farben's Product Division III (photographic supplies, artificial silk and cellulose-based products) two years later, whilst he was also made a full member of IG Farben's managing board in 1932.These roles required him to work closely with Dynamit Nobel and as such he was on that company's supervisory board from 1936 until 1945.