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On my team, the last person we hired intending for backend was advertised as full stack. Even though the primary focus was on backend, there were some weeks/months where our Android developer needed some help or we wanted to add a bunch of features to our internal admin tool (written with Python/Javascript). Even though a typical week might be 100% backend Clojure, we needed a generalist to be able to learn enough to contribute from time to time to Java on Android, Javascript on Chrome, or Python/Flask (although typically in a dedicated multi-week project).