Looking for a Verified Trading EA

Hello there. I am full time day trader and I am currently looking to build my own EA through the expertise of a professional but I thought it would also be interesting to see if there are any EA's that have been tried and tested by professional coders/programmers and try it myself. I have a budget I am willing to go to. If anyone has any verified EA's already tested and potentially even on the market already please do get in touch.