Custom Apps within WordPress

Hello WP community!

So I’m looking to develop some apps that would benefit our business. We’re in the scrap metal recycling industry.

Basically, I would eventually like to have some sections for different functions for our company. For example…

– Inventory
– Purchase Orders
– HR
– Document Management
– Etc….

So my question is, has anyone ever done something like that? Are there plugins that would make it easier to do so? Obviously, there are plugins that would make this easier to do (Advanced Custom Fields (I currently have ninja forms), User Roles, etc….)

So my question is with how much this community knows, has worked with certain plugins, is there any recommendations for bringing this to life?

Thanks in advance!

– Randy