Julian is a heavy-duty number cruncher for Wooga, a mobile games developer based in Berlin._ There’s one unfortunate truth about mobile game development. You cannot make a great game, offer it for free and depend on the masses downloading it. The app marketplace is packed, with every publisher desperately vying for players’ attention. This makes that attention all the more costly to acquire. Most developers will, at some point, face the problem of getting people to use their app without dangerously overspending while doing so. They need to buy users at a price where they get a positive return on...

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