[rdelval]

The asymmetric time investment required from candidates is what bothers me the most about these coding challenges.

My personal experience has been that it's a lopsided process with the candidate putting in hours of unpaid work and the company spending one, maybe two engineering hours if we're being generous, reviewing the submission.

If the reviewer decides to reject the challenge, the loop closes, HR sends a nice e-mail, and the candidate has nothing to show for it.