For those looking for post bac RA & research coordinator positions, I used these sites to job hunt:
https://gupsychology.wordpress.com/
https://psychologyjobsinternships.wordpress.com/
https://undergrad.psychology.fas.harvard.edu/post-graduate-research-jobs
http://clinicalpsychgradschool.org/pbacc.php
https://psych.wustl.edu/news/psychology-research-opportunities-undergraduates-post-bacs
https://main.hercjobs.org/jobseekers/index.cfm
I think ultimately I wound up finding my RA job on Indeed, so that's also a good place to look. I cold emailed some people with no success (I don't think it's weird to do that!) and searched career portals of hospital systems & universities I was interested in.