Depends where you live but nextdoor could be good. I've seen tons of replies on posts with offers of services like these. Has the benefit of being hyperlocal too.

in response to Ruby Claire Johnson

Does anyone know of a good resource for finding sewing piecework or contract production sewing jobs? Is there a list or directory? I’m looking for freelance work I can do from my own sewing studio, think small-batch production, assembly, etc. I have industrial machines, equipment! Would love any leads or recs!