In 1908 he moved to Munich and began studying book production at the Debschitz-Schule [de] in 1911 under the tutelage of Paul Renner and Emil Preetorius.
[1][2] He worked as a freelance type designer from 1914 onwards; his clients included the newspaper Münchner Neueste Nachrichten and other publications.
[2][3] In 1923 Jost was invited by Georg Hartmann[2] to become the art director of the Bauer Type Foundry in Frankfurt am Main.
[3] At Bauer, he oversaw the work of designers such as Paul Renner, Lucian Bernhard and Imre Reiner [de].
He also designed Jost Mediaeval for Ludwig & Mayer (1927–1929) and a revival of Fraktur for Monotype (1938).