I think he got the job by Hanging around the Employment Office, He would have been absolutely ropeable when he found out what the job actually entailed.
He would have hanged some realy horrible people, i wonder if he actually slipped the black hood over their heads before he pulled the lever on the trap door.
I guess none of them ever got in touch with him in the afterlife, after the judgement seat session. The stokers would be waiting for them too. all the best Glenn from you know where .