[ajb]

Depends what for, of course. Something that needs 24-hour on call, obviously not - you have to sleep sometime. Realistically though in terms of 'solo' - exactly 1 employee - I won't know unless you tell me. I will be able to tell that you are a small company. I won't be able to tell that you don't have a co-founder. I might guess from linkedin, but not everyone has a linkedin account.

What does make me suspicious are companies which don't identify themselves - no identifiable person or address.

Otherwise it depends on what you are asking me to rely on you to do, and what are my options if you fail.