What backend technology ( ies) I'll have to use to change/ react to data changes in the database and it instantly updates the changes in the other devices?

For example in the following list view.

A user is logged-in in multiple devices, The moment the value of 1st object chnage sin the db, it shoudl update instantly.

I currently use mongo.
Shoudl i use Redis with socket io or both or what else ?

just google about firebase and 3 way binding

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Not a fan of firebase.

from your requirement i think you need 3 way binding.Unfortunately i don’t know any options other than firebase