Is it permissible for a Muslim to work on a pig farm, taking care of the pigs and cleaning the farm for a small wage, due to the unavailability of any other work?

It is not permissible for a Muslim to work in raising and caring for pigs, even without wages, and whatever he earns in exchange for that is unlawful according to Islamic law. And whoever gives up something for the sake of Allah, Allah will compensate him with something better.