Far and away the biggest is focusing on the tools instead of the customer's problem. Accidental complexity ramps up quickly. Been there. I still remember coding and thinking things like... "I don't understand why they want this." or "This requirement is going to be awkward." And instead of asking about it, I filled in my own assumptions. And it didn't turn out well.
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Any examples?
Far and away the biggest is focusing on the tools instead of the customer's problem. Accidental complexity ramps up quickly. Been there. I still remember coding and thinking things like... "I don't understand why they want this." or "This requirement is going to be awkward." And instead of asking about it, I filled in my own assumptions. And it didn't turn out well.