I applied to three postdocs (CITP, Cornell DLI, Microsoft SMC) in the Fall of 2023, interviewed for two (CITP and DLI), and received one offer (CITP; which I happily took). while looking for these opportunities, I had compiled a small spreadsheet of annual postdoc calls, available
here. there are plenty of other exciting one-off postdoctoral opportunities that come out each year (I applied to one such position but never heard back), but that's not reflected here. you're welcome to reach out with questions, although you will probably get better advice from more recent applicants.
I used to have decently lengthy notes here with advice on applying to the NSF GRFP. as it is pretty outdated at this point and my site is manually maintained, i've taken it down but feel free to cold email me if you want them / my old apps (plus reviews).