I use Lutron. But they use a proprietary protocol (with local control however)

It’s apple autocorrecting YOE lol

As someone with more than 5LOE I’ve found that technology matters less and general concepts are more valuable.

So look at system design concepts, how infra you use typically works (pubsub, databases, etc), how companies solve problems (engineering blogs from companies like slack, meta etc)

Learning new languages only helps if you are currently working on something obscure.