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I work for a very large engineering and construction firm whose name has been much in the news lately. Unfortunately our hours are more like 7 to 5 than 9 to 5, but there it is......
I do control systems design. Whazzat, you say? Most refineries, chemical plants and energy installations are controlled by computers. My job is to design the connections between those computers and all of the devices by which they actually control those facilities; sensors of various kinds, analyzers, instruments, detectors, switches, valves, pumps, compressors and so on.