Lit reviewing "developer experience" as a construct and earliest thing I found in initial search is from Fagerholm and Münch(2012):
F. Fagerholm and J. Münch, "Developer experience: Concept and definition," 2012 International Conference on Software and System Process (ICSSP), Zurich, Switzerland, 2012, pp. 73-77, doi: 10.1109/ICSSP.2012.6225984.
It doesn't reference any existing literature on developer experience. Google ngram also shows a HUGE spike in "developer experience" mentions in 2013.
