A mechatronics engineer works to automate the transfer of materials and goods, and the manufacturing process. Their tasks involve identifying areas for task automation, designing, developing and testing potential mechatronic devices, and implementing design solutions.
A typical tea bag has somewhere between a gram and two grams of stuff in it. If the entire contents were nothing but fructose, and that fructose completely dissolved when you made your tea, you'd consume between 4 and 8 calories (carbohydrates contain 4 calories per gram) per cup of tea -- so that's the ceiling.
To accomplish this, boil two pots of water. Steep the tea bags for less than a minute in the first pot of water. Remove the bags and discard the water. Steep the tea bags in the second pot of water as normal. The result is 90-95% caffeine free tea.