No, it's been twice I've gotten the "not enough experience" (non) answer. Once, the recruiter literally told me they were looking for someone with more "API experience." I don't even know WTF "API experience" is if not back end web development, and you can clearly see the number of years' experience I have in that on my resume.
All I could venture to offer to explain that feedback would be: did you use proper http codes? Post vs get vs put vs delete? Headers? Auth methods? Did you sign the requests? Maybe something else I'm forgetting.
