While he mentions working for a "soap company," this is never explicitly elaborated on. It's implied that his work with soap is a front, and his true source of income and purpose is far more sinister.
It's important to note that the film deliberately leaves much of Tyler's backstory and motivations shrouded in mystery. This ambiguity adds to his allure and contributes to the film's exploration of themes like masculinity, consumerism, and the search for meaning in modern life.