It is very possible that your employer will find out that you were convicted of domestic violence in Pennsylvania. When a person is charged with a crime in Pennsylvania, it becomes a matter of public record. The case and the charges and anything that takes place with respect to the case would be posted in the Pennsylvania public court dockets which is available online. As the name implies, anyone from the public can access that information.
If a person is convicted of a domestic violence crime in Pennsylvania, their record would be maintained by, among others, the Pennsylvania State Police. The FBI would also have certain records. Other law enforcement, government, and court agencies would also have records related to the case and that conviction. If your employer did a background check, it would be relatively easy for them to learn of the domestic violence conviction.
Because so much is at stake, including a person's career and employment opportunities, having an experienced Pennsylvania criminal defense attorney will be your best ally to help you understand and navigate the criminal process and to defend against domestic violence charges.