From 1978 to 1980, he served as an Assistant United States Attorney in the Criminal Division of the United States Attorney's Office for the Eastern District of Pennsylvania. In 1977, Justice Rivera-Soto was an intern in the Office of the District Attorney of Delaware County, Pennsylvania. Justice Rivera-Soto is currently a Certified Mediator in the U.S. District Court for the District of New Jersey, member and the current chair of the District VII Ethics Committee of the Supreme Court of New Jersey.