Custom App Development - Nextcloud Freelance Developers Needed!

Looking for a nextcloud/app developer who can develop a custom app in the files tab that connects signing servers in the backend. I have the backend setup and need the front facing app on the platform. I have the initial spec for the app development and can share further information on contact. Willing to pay for the app development. (I also, appreciate any guidance since I’m trying to take a stab at it)