You obviously have no idea how this works, which is fine. Everyone has to learn sometimes.
#1:
What you're asking for is referred to as "Spec Work" which is short for "Speculative Work". It's highly despised. Large companies get away with it since the stakes are so high (i.e., "Make Music for the new Tekken game and get a chance to have your song featured in the soundtrack!").
Why is Spec Work so despised? Take this scenario:
Five producers out of 100 could do an awesome, knock-out job well worth the full pay you're asking for (or more!), but 4 out of these 5 (80%) of these "Top Tier" producers will end up walking away with nothing to show for their outstanding efforts.
#2:
You pick a mixing engineer based on his portfolio, reputation, and word-of-mouth, factoring in how much you're capable of paying and how much you're willing to pay.
#3:
I downloaded your archive package. These are not proper stems -- these are simply raw recordings. They're missing the silence which aligns them to the proper positions. Please line them up properly, via either:
- a "bounce stems" feature or
- by soloing each individual track and performing a whole-song render for each one, naming each one appropriately (i.e., "Verse 1", "Verse 2", etc.)
#4:
These aren't clean takes (Almost, though. I've definitely received much worse). There is slight clipping distortion throughout your takes (which can be repaired/hidden), but at "opening doors" toward the end of the first verse, it's bad beyond repair.
I didn't listen past the first verse, but I would assume that there's some distortion on the other verses.
-Ki
Salem Beats