NFT layer generator app as Saas

Hi there,

I am looking for experienced team to develop a simple web app where users can upload their layers and generate collection with export Jason option as download and upload to OpenSea.

First we need the web app to be SaaS users will be charged monthly or weekly to access.

Sites with features like we want:
Autominter.io you can search on YouTube to see.

I only need developer who already worked in such project features !

Anything beside that going to be ignored.

Thanks