more like a job of a demolition man looking at the dmc anime lol
but seriously,he is always broke and always owes people,i don't think he has any other job. except when he runs out of pizza lol
and as for the password,i don't think its dmc-ish to pick up the phone,say devil may cry,how can i help you and constantly wait for something like,is that the legendary dark knight sparda or something? ... on the other hand that would be a cool password! .. anyway,possible that the password can be an act rather then a word,or even a demon himself threating to kill him and dante goes: great. another one. heeere we go again. it does sound like an exterminator job as who in their right mind would talk on a phone while demon tries to slice and dice them into shreds? confusing..