Good cryptotraders that are trading round the clock, would definitely have no time for an underpaid gig.
That's basically the exact reason why you're not going to find a qualified trader at all. I'm sorry to tell you this, but any successful trader will just trade on his own. The outcome is better than any 9 to 5 job usually, and traders don't seek for a part-time job that pays way lower.
So if anybody wants to work with you, you can almost assume he's not successful and his signals won't be accurate.
But actually there are some professional traders ride to this service since it's an additional income for them if they can gather more clients, try to see the McAfee Magic service where they hire traders to shadow there trading result(Though I don't recommend them). And for OP just do a strict test to see your potential traders result so that you will not get a jerk who will mess the money of your investors.