I've had years of experience mixing and mastering audio in a professional studio environment. I'm new to Freelancer, but I can guarantee a desirable product with a faster turnaround than anyone else (usually same day turnaround)
I master in Pro Tools and use a mix of in the box and outboard gear including: Dangerous Audio Summing, Manley Massive Passive, and UAD Shadow Hills.
I do not see an option to upload a track with this proposal, but I have a few songs in my portfolio that have all been mastered by myself.