Developers can also be the users, as we are using specific tools for our jobs, and those who develop that tools should consider us as an end user, right?
I don't see the reason for the whole new branch of design.
Well yes and no. Yes, developers can be end users, for example, GitHub users are programmers and here all will be the same. But if we talk about best practices of designing APIs, frameworks and programming languages, which is also DX, this is absolutely stranger subject for traditional UX.
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