At the same time Balderas had completed the translation of the "Pearl of Great Price" into Spanish on his own; this was completed under church assignment, but he was the only person on the project. In 1939, Balderas became the first person employed full-time by the LDS Church as a translator. He also worked on the first translation of the temple endowment ceremony into a language other than English, specifically Spanish, in cooperation with Ivins. In 1961, Balderas helped Marion G. Romney improve his abilities in Spanish so he could more effectively function as the area supervisor for the church in Mexico. Balderas was still working as a translator for the church in 1974, also giving lessons on how to use the "Liahona" magazine in a church lesson.