Mix and mastering

Hello I am looking for a mixing and mastering on consistent production soongs. I want to send you a song and see what you can do with it

Additional info:
I'm interested in working with a very experienced mastering engineer. The song has somewhere between 10 and 30 tracks recorded that need mixing. The song is mixed and ready to be mastered. I need it by 31 October, 2023. . I work for a business with music production needs.