We build the part that is hard, first
Most projects start with the screens because screens are visible. We start with whatever will be genuinely difficult — the money changing hands, the state machine an order moves through, the rule nobody can state out loud yet. On the operations platform that was made-to-order production: every item is built for one person from measurements a scanner takes, and the system has to hold that thread from the first appointment through manufacturing, delivery and a remake eighteen months later. Twenty-one data models exist because that thread does. If the hard part is left until week six, everything built before it gets rewritten around it.
The platform that thread runs through



