To what extent is the salary permissible for an employee of a German company that has shares in the stock market and deals with banks?

If the original work of the company is permissible, but it sometimes deals with unlawful matters, such as borrowing with interest (riba) or dealing in the stock market without Sharia controls, then it is not permissible for a Muslim to work there if their job is directly related to the unlawful acts or assisting in them. However, if their work is permissible, then there is no objection, and their ruling is like that of someone who deals with the owner of mixed wealth.