It's not Western Michigan, it's not Michigan State, and it's not the University of Michigan.  Give up?  It's Flint's Kettering University.

Kettering University is a private university offering bachelor's and master's degrees in STEM and business fields.  The University works closely with automakers in Michigan and has extensive internship programs.  Because of the close relationships with automakers, Kettering boasts a 95% chance of finding employment in graduate's chosen fields.

Zippia.com did the study that determined the colleges with the best employment rates in the nation.  Here is a bit of the methodology that they used:

"...we searched for the college in each state with the highest listed job placement ratings, looking specifically at employment levels at year 10 after students have graduated."

In addition to Kettering having the best employment rates in Michigan, it also has the 11th best employment rate of universities in the nation.