I do embedded on the metal with no or RTOS, in C. Embedded on Linux (think Raspberry pi form factor) with Python and other Linux stuff. At Swift/Kotlin/Dart for mobile apps. A different sort of full stack where we're developing the gadgets and the apps that interface with them through bluetooth.

Interesting! Once you're at Swift and Kotlin, is there any reason to pick up Dart?

As a web dev, I've done Ruby, JavaScript, and Common Lisp; and have dabbled in Dart, Elixir, and now SwiftUI. If I wanted to start building mobile apps, I'm wondering if that would suffice or if I'd have to pick up Kotlin as well.