As I see it there aren't front-end and back-end developers, there are just developers. There are roles that involve mostly or exclusively front-end and back-end web development, and should maybe be called front-end or back-end, but the defining characteristic of a developer is that they can learn technologies and languages and use them to solve a given problem.
Standardizing the role might make sense within a given company, but across companies the requirements are likely to vary, and the front-end technology landscape evolves from month to month.
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