Need HELP - Polymer newbie

[Francesco]

Hi Everyone,

I have been given a task to develop a web application, and I'd like to use this opportunity to dive into and learn about Polymer (and maybe Vaadin components?).

I developed a little simple PWA before, from scratch, no framework, etc. Just using Workbox for caching, nothing else. So now I would like to jump to Polymer and a more structured approach, but to be honest I find myself a bit overwhelmed with the task!

Is there any saintly soul willing to guide me on how to approach the following task?

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Create an application which will allow at least two users to log in simultaneously and manage items in categories. The categories should be in a hierarchy of potentially infinite depth. The items only require a label.

The users should be able to perform standard CRUD, plus if one user makes a change, the other user(s) should see the change (if appropriate) without manually refreshing their web browser.

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How do I approach this with Polymer? 

Has anyone done anything similar?

I'm also open to Vaadin components if it helps.

Any help or guideline?

I look forward to your replies!

🙏