Feedback on just a resume with no prior connection is pretty much not going to happen. The number of resumes submitted is generally way too high to look at a resume long enough to write anything worth sending you.

Feedback on interviews can happen, but in my experience as an interviewer, when I've given feedback, candidates want to rebut it. That doesn't feel like a good use of my time, so I won't entertain requests for feedback anymore. For a very few candidates, I have reached out to the candidate to provide unsolicited feedback, like if they did pretty well on my interview but were missing some fundamentals and did poorly with the rest of the panel, and some guidance on things to study for future interviews would help them on future interviews; or they weren't a good candidate for the open position(s), but they seemed like they could do well in a different type of position.