Bottom line, these people need to make stuff, fast. They need to prove or disprove concepts, in ways that non-technologists understand, fast. So they need to know how to code efficiently, economically and effectively. They need to understand the appropriate technology stack from top to bottom, know which tools are right for the job – and most of all, they must be prepared to crack their knuckles, roll up their sleeves and get their fingers into the code. Up to the elbows.