Collaborator access of a public app under development

We are currently building a public Shopify App. There isn’t a place to invite collaborators on an app since it’s not a store. What is the recommended way to do this??
Do we both create our own Shopify templates(Ruby) app and install each on our own development store?

Then share the code in the /web directory on GitHub.
Is it the proper way to collaborate on a public embedded Shopify app??