The Institute for Broadening Participation (IBP) has postdoc funding opportunities and positions for STEM students.
Currently, they have 182 different postdoc opportunities across a range of STEM disciplines, funded by NSF, NASA, NIH, and university and research labs across the country. You can find them, along with some tips on applying, interviewing, and negotiating a postdoc position, here: http://pathwaystoscience.org/Postdocs_Portal.aspx
Their advanced search page is also a useful tool for narrowing down the selection of positions: http://pathwaystoscience.org/programs.aspx?adv=adv
Students may also follow us on social media to stay abreast of new opportunities: