Kanoi, I don’t know where you live but b”H I have lived in Israel for 25 years and I know people who work even though they have not done the Army for various reasons (too old when they came, medical reasons etc.). I also know young men who worked before their actual enlistment date. Once more, an Israeli citizen who is not learning full time (or at least registered in a yeshiva/kollel and not caught) is eligible for the draft. Until and unless he actually enlists he may work for whomever will hire him. It could be that employers will not be quick to hire someone who may be drafted in the near future but
that is their consideration. So far as the law is concerned they may hire them.