Jane Street onsite interview difficulty

Has anyone here had an onsite interview at Jane Street for a software engineer position and can comment on the difficulty vs. other big tech companies? There's plenty of information on glassdoor about

Has anyone here had an onsite interview at Jane Street for a software engineer position and can comment on the difficulty vs. other big tech companies? There's plenty of information on glassdoor about phone interviews there and about onsite interviews in functional languages, but I'm looking for information on onsite interviews in non-functional languages.