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Presumably 'developer experience', given how it's used in conjunction with 'user experience' for a developer-focused product :)

Admittedly not the most easily understood acronym, and I'm sort of guessing.

Thanks. Of course now it seems obvious enough in context that I should have inferred this. Oh well. :)

If you search for

UX DX

you will find lots of hits about.

Dev ex machina :)