You will start in entry-level positions. At this stage, you might work on testing. Studying industry regulations is another way forward. Your exact role depends on your core industry and organisation.
Based on your experience and skills, you can get promoted to senior positions. You would then lead a research or design team. You may also conduct experiments.
Some also pursue post graduation and go on to lead research teams at work. Others pursue MBA for acquiring managerial positions. You can also take up teaching or start your own business.