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In seriousness, probably data analytics shit. So like writing BigQuery and Python scripts all day. Not super hard but requires a good amount of knowledge of stats and programming.
That's a management decision. If nobody told them to make new features, engineers were probably working on site reliability shit and just keeping the teetering mass of the fourth-most-popular website from falling over. Big systems are really hard, e.g., and they're always growing. Dan Luu probably has written other relevant stuff
probably some to do with analyzing data, doing backend shit, and selling fun data to customers