Design is “engineering”. Engineers design, by definition[0]. Design, contrary to popular belief is about solving problems. Industrial design in particular focuses on how things work, not just the aesthetics of an object.

[0] from the OED: a) To make drawings for the construction or creation of (something, as a building, object, garment, etc.) according to certain aesthetic criteria; (b) to make plans for the production of (a device, product, etc.) according to structural or functional criteria (sometimes without the implication of aesthetic requirements); (c) (in extended use) to conceive, devise, plan (something immaterial, as a scheme, system, programme, etc.).