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A quick lookup suggests that the difference between a Full Stack Developer and Full Stack Engineer is that of project management and systems admin.
So what if you are the project manager, team lead, front+back end, support, setup admin?
Does it just role back round to being Developer?
Or a point of stopping and saying "hay, how about we hire some new people"
No, a stack is the pile of printed requests, bug reports, personal idea scratchings/doodles, your 3 missing keycards, urgent to-do lists, last weeks half eaten sandwich and your neighbors stapler in the in-tray.