I have recently joined two very useful mailing lists. One mailing list is for those who work in the interface of biology and physics. Another one is for Machine learning. These both are great for those looking for jobs(both academic and industrial). You can see a lot of Ph.D. advertisements, postdoc vacancies, and project assistant vacancies, etc here. The links are below:
[Dear #steemstem curator: Please don't upvote this post. I am just sharing a piece of valuable information via steemSTEM tag.]
Another one: http://www.ccl.net/jobs/