Hell Yes. Break it down further: the front end demands that. You could split further into front end architecture, front end UI performance (DOM etc.), web performance (taking into account network etc.), tooling. Even getting NPM to play nice could become a full time expertise!

The "developer". Can do anything that involves smashing at a keyboard! It's like calling a politician a "talker". Oh well you could do ground control for the next moon launch then, that's just a "talker".