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According to this, 9% of the population in Dublin are software developers. By comparison, London seems to be at 7.7% according to the same metric.

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Dublin is a small city - I was surprised myself for the first time when I was there I expected it to big european capital. In fact population of Dublin is ~500k and they even market it as "Dublin Town". From the city center most of places are available within 5km radius.

And to clarify, the size of Dublin is relevant because even if smaller cities have a relatively lower mean proportion of software developers, the law of small (!) numbers tells us the variance in the proportion of software developers will be larger, meaning some smaller cities will have the lowest fraction of software developers, and others (perhaps like Dublin) will have the greatest fraction -- just by chance, not due to underlying causal mechanisms.

Ireland is small! Much smaller than I thought, I was shocked when I learned that Ireland has half the population of Sweden.

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