While it is normal to have a degree of tiredness in your feet at the end of a working day generally, no, it is not normal to have pain in the feet. Feet are engineered to stand and to walk and given their normal function and environment they do this very well. With that said, there are abnormal internal and external factors that may lead to deterioration in function and either instantly or overtime stress the internal structures of the foot and leg and this is usually where pain develops. These factors can include external environmental factors such as hard flat surfaces or internal factors that involve developmental / alignment of your feet and lower limbs. If you have high levels of pain or pain that lingers after you have sat down after work or that comes and goes regularly it is best to see a podiatrist to investigate the underlying causes and get you back on your feet!