I need a professional, seamless mix of a 3 hour playlist on spotify

Hi, Before you contact, I am only looking for someone where the mixing is done by you specifically to create a sequence order of tracks by tempo. I have hired a couple of people before and they weren't in tempo order so I need someone to "actually" mix the songs into each other. I have used several apps and the order is never good (they put a high tempo song next to a slow song) and the songs are just faded in and out automatically via fade in/out so it doesn't sound good. I am not looking for simple fade in fade out as I am able to do that one spotify already. Please contact if this is something you can do in sticking with all of the criteria. Thanks so much in advance Zoe