Will a DWI show up on an employment background check?

In New Jersey, DUI is not a criminal offense; it is a traffic violation. Therefore, it will not show up in a criminal background search ever and you can honestly state on any application that you have not committed any crimes, felonies or misdemeanors (assuming that the DUI and any other traffic violation or ticket are the only items in your background).

The only way it will come up is if your employer looks at your driving record (usually only if driving is a critical part of the job) or if the employment application specifically asks if you have had any traffic violations. Other than that, your employer will not find out and will not be required to say anything unless there is something in particular on the application or employment agreement.