The big question is typically how to divide the teams. How you do it is situationally dependent. Sometimes it’s by function of the product, sometimes it’s by layers of functionality, sometimes it’s by customer segment—but the most important thing is that you keep the customer, mission, metrics, and codebase together with that team. That last bit—the codebase—is the hard part because you have to plan ahead. Likely the system was built as one large codebase, and in order to split your teams, you must refactor the system into two codebases that two teams can independently own. This takes time;
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