text: what does an interior designer job description look like?   interior design is the process of shaping the experience of interior space, through the manipulation of spatial volume as well as surface treatment. interior design draws on aspects of environmental psychology, architecture, product design and furniture design in addition to traditional decoration. an interior designer is a person who is considered an expert in the field of interior design or one who designs interiors as part of their job. in many jurisdictions, interior designers must be licensed to practice.