Melissa recently started a new job. Her days consist of operating machinery, lifting heavy objects, and doing a lot of measuring. Which career has Melissa most likely started?

Heavy is a relative term, and will be assumed to imply objects greater than 40lbs. Therefore, it is most likely that Melissa has started a new career in a machine factory, where she is required to operate the machinery, measure the correct cuts to be made, and lift heavy boxes of parts to her station.