By way of further detail:
I started my GM career at Chevrolet Flint Assembly, the plant that produced C/K pickups, Blazers and Suburbans, back in June of 1979 (pickups were built on Line 1; Blazer/Suburban were build on Line 2). As a GMI student (ie, "General Motors Institute" - GM's own college) we worked in every area of the plant, including Engineering, Specifications, Material, Production, Inspection, Maintenance, etc in order to provide a well rounded, cooperative work experience.
After I graduated with my Engineering degree my first "real" job was as a Production Supervisor, Line 1 (pickups) Fender Set area, second shift. My area started just after body drop and extended down to "hood set". We installed the fenders, batteries, manual shift levers and spare tires, and tightened down the box bolts (plus any body mount bolts the previous area missed!). I had 27 production operations on the line, plus a couple absentee replacements, a couple "Utility men", one repair man on each side of the line plus one Quality Man (which is your "right hand" man), for a total of about 39 hourly employees.
After doing that for a couple years, in 1986 I was able to move over into an Engineering/Assembly liaison position. In this role, the engineer travels from plant to plant, assisting in new product launches and resolving start up build issues. During this time I was able to travel to the other C/K plants, like Oshawa, St Louis, and Pontiac, becoming familiar with their build processes and the similarities/differences to the Flint plant.
Next, I moved to the GM Milford Proving Ground as a full vehicle Development Engineer, still associated with the C/K/R/V vehicle. One of the issues I worked on was the old "brake pull" issue, which some of you might remember (particularly bad on the straight axle Blazer). I used to bring customer vehicles on property to work on or travel to various dealerships around the country to fix trucks that they could not.
After three years at Milford I was fortunate enough to weasel my way to the GM Desert Proving Ground. During my four years at the Desert I was first a driveline development engineer for light truck and then a brake development engineer, still for truck.
My first Design/Release position was back here in Michigan in January of 1994. I was the Engine Air Induction DRE for the GMT800 program. The airbox I designed is still in use today.
By this time the organization had restructured from its previous "platform" organization into a "matrix structure". Most of the engineers became subject matter experts (ie, the tire/wheel guy would release tires across all GM model lines, as would the interior guy or the body guy) but a few of us became "Platform Engineers", staying with the respective models. During this time I was the vehicle engineer on the 2001 GMT820D and 2002 GMT820C (the Denali and Escalade), the 2003 pickup, wrote the original engineering plan for what would become the Hummer H2, the 2007 GMT900 SUVs and back to the 2008 H2 program. During this time I worked in every Full Size Truck assembly plant in North America, including the aforementioned Flint, Oshawa, St Louis and Pontiac plants, as well as Arlington, Janesville, Silao and Mishawaka. Finally, after 29 years and 7 months, I left the truck group and moved over to the Chevy Volt program, where I was the Assistant Program Manager (or Acting PEM) for the export models. I did that for four years and went back to truck, as a design/release engineer for the K2xx underbody structure (cab and box) and for the GMT610 program. That’s where I was working when I got enlisted into my current position, with the GM Performance Parts group in the Specialty Vehicle Organization.
As a result of a brief stint on the T1 program I have now worked on 6 generations of GM full size trucks.
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