Bantjes started working in the field of visual communication in 1983 and worked as a book typesetter from 1984–1994. She became well known as a talented graphic designer from 1994–2003, when she was a partner and senior designer at Digitopolis in Vancouver, BC, Canada, where she created identity and communication designs for a wide range of corporate, education and arts organizations. She owned and ran the design firm, with a small staff.
In 2003 Marian left her firm and "strategic design" behind to embark on the work that she has since become internationally known for. Describing herself as a Graphic Artist, working primarily with custom type and ornament, Bantjes' highly personal, obsessive and sometimes strange graphic work has brought her international recognition and fame as a world-class visual designer. Bantjes is known for her detailed and lovingly precise vector art, obsessive hand work, patterning and highly ornamental style.