Are those the only two categories of engineers you are currently looking for? I consider myself a generalist (10+ years), but I don't want to embarrass myself if you're truly looking for a strong backend Java engineer.
I'd like to be considered for the DevRel role, but I don't have demos I could share. Are you looking strictly for DevRel experience?
My last role was Senior Software Engineer and hands-on Technical Lead, working with external contractors+organizations, which involved many demos and sharing reusability across teams.