Following the end of the First World War, Eicke remained as an army paymaster now in service of the Reichswehr of the Weimar Republic, until resigning from the position in 1919. Eicke began studying at a technical school in Ilmenau, but was forced to drop out shortly due to a lack of funds. From 1920, Eicke pursued a career as a police officer working for two different departments, initially worked as an informant and later as a regular policeman. Eicke's police career was ended in 1923 due to his open hatred for the Weimar Republic and his repeated participation in violent political demonstrations. He found work in 1923 at IG Farben in Ludwigshafen and remained there as a "security officer" until 1932.