Is it permissible to work as a software engineer at a trading firm, where my role would be to develop the systems and tools used by the company for various types of trades, which may also include binary options?
You as a Muslim should be very careful not to be involved in unlawful business and your software should not be used in any type of transactions which are not permissible in Islam. Binary options are considered by many as a form of gambling rather than an investment because of their negative cumulative payout.
'Wassalam.