With the state ranking in the top 10 in engineering employment, this shouldn't come as a surprise. The auto industry is engineering intensive, from R&D all the way to the actual manufacturing of the product. Each assembly plant usually has over 100 salaried workers on staff, many of them engineers not to even speak of the hundreds of parts suppliers. Before that, though, the autos, both domestic and many foreign ones, have huge R&D facilities, here.
As more an more tech is being integrated into automobiles, the need for engineers is only growing:
Metro Detroit on par with Silicon Valley in tech jobs. Whether you define is more broadly or more strictly, the region has been an engineering hub for decades.