Hi, it is completely fine to have a job before you graduate. What you need to look out for is if your firm where you will be working will allow you to study and work at the same time or you can complete your studies and then start your job. EVery firm has its own set of rules and hence it depends on which firm you will be working for. Usually when you get an offer and you are asked to join after your studies are completed they are merged that way. You still need to get it confirmed by the firm you will be working for. If you still have doubts please feel free to comment. Hope this helps.