Hi there, thank you for considering my services!
On top of working on pixel art, my experiences in background illustration and design would definitely come in handy when creating stages background and tilesets.
Furthermore, as an illustrator, I'm confident that I'll be able to accurately translate your design sketches into a pixel art design. Depending on the difficulty of design and number of pixels, I would be able to finish up to 1-3 backgrounds or a minimum of 5 tilesets per day.
Further discussions can be done to better understand your project and to aid in the design direction.
Lastly, for some reference on pixel art that I've done, feel free to look up my instagram account: fel_sierra
p.s. : If you're interested in hiring any freelancers on this platform, do remember to start a chat with the freelancer. Freelancers are unable to start a chat, and are hence unable to communicate with you if a chat is not initiated by an employer. Thank you :)