 From 1928 Wildermuth was director of Deutsche Bank's construction operations and in addition from 1930, board member, later president of the German Society for Public Works.Wildermuth served in 1908/09 as a one-year volunteer in the 1st Württemberg Infantry Regiment.He returned as an officer of this regiment in the First World War, serving from 1914 to 1918 on the Western and Eastern Fronts and in Italy.