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I create control systems, currently in the automotive industry but the same principles apply to any control system, which is the thing I love about this subject. The skillset is about trimming down a problem to it's absolute bare essentials. I always wondered what makes machines tick and control theory is the systematic expression of that pursuit. We model the system or phenomena in question and then develop the control in simulation. Once we have the desired result, it is usually realised as a software object that is embedded in a computer.
I started on this path as an unemployed and disillusioned 32 year old engineer, retrained over a period of 2 years and it turned out to be a huge source of fulfillment.