Which job portal is works best for industrial designers?

Core 77 community and job portal are mostly geared towards ID. Not sure how active they are now, but do check. Most of the jobs will be international though.

There is no specific website as such. You have to build or enhance your personal network to get a new job in your target company. Make a wishlist and focus on networking with friends and ex-colleagues who may be working there or know someone whom they can refer you to.