Is it permissible to work in programming control and monitoring systems for refrigerators and chillers used by hotels and commercial establishments that sell alcohol and pork?

There is no harm in the aforementioned work as long as refrigerators and cooling devices are used for good or for bad, and there is no direct assistance to the unlawful in this. The machine may be used for permissible or prohibited matters, and its use is not exclusively for unlawful purposes.