Specify it for tutorials - yes.
Specify it for your job title... I'd argue no.
I'm a full-stack developer. On my CV, in the description, I'll outline WHICH stack. But not in the title. "Fullstack developer" is still a valid title at any level. Most company's will only use 1 stack type, so having you specify your stack in your title would be unnecessarily convoluted.
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Specify it for tutorials - yes.
Specify it for your job title... I'd argue no.
I'm a full-stack developer. On my CV, in the description, I'll outline WHICH stack. But not in the title. "Fullstack developer" is still a valid title at any level. Most company's will only use 1 stack type, so having you specify your stack in your title would be unnecessarily convoluted.