T-Shirt Designer for Amazon Merch and other Shirt- platforms

We need a creative t-Shirt designer with skills in photoshop for our t-shirt- business.
The payment is per accepted t-shirt design and is negotiable at the beginning. If the quality is very satisfactory, you will be able to enjoy a rich bonus.
A professional handling and fast delivery of up to 10 designs per day are required.

File format PNG, JPG, better vektorfile
Maximum file size 10 MB
Minimum image resolution 300 dpi
Every Design in the size 4000 x 4000 pixels and the second design in size 4500 x 5400 pixels
Design is free for use