[jeromyevans]

Your employment contract or a related document you've executed may include a post-employment restraint/non-compete. These vary a lot by level of the position and type of work. They are difficult/expensive to enforce and are open to interpretation about "reasonableness". These are generally the former employer's best means to prevent you from immediately reproducing something. However they also can't prevent you from working in your profession and using what you've learned as a professional.