I recently applied to some post-doc positions at well-ranked universities whose number of candidates is usually not so large (ca. 15, at most 50). Usually, the recruitment process consists of a formal interview, and sometimes, a pre-informal one where candidates are first "filtered".
I'm not aware about the main procedure after such interviews conducted with candidates. I got only 1 feedback from a university being totally transparent on this procedure; i.e. you get a document showing (1) the candidates selected and those non-selected, (2) their ranking in the selection, and (3) comments about the selections made. This makes me think, is it authorized in general as an unsuccessful applicant to request feedback on the outcome of my application? I wish decisions taken were more transparent so that unsuccessful candidates could at least situate themselves in the pool.