I would think that the type of person that is a designgineer is likely to be informally trained, usually starting as a design person and becoming increasingly more technical over time. Because of this, I reckon they would do poorly at a lot of the types of technical interviews that are in fashion today, such as puzzle interviews and data structure/algorithm questions that you'd probably only do well with if you had a…
web design as a kid + DT at school + always inventing things -> Industrial Design at uni -> interest in developing product from both the user facing side and technology behind it.