Persona AI is building humanoid robots for the most demanding environments in heavy industry — shipyards, steel mills, fabrication facilities, and offshore platforms — performing welding, grinding, maintenance, inspection, and material-handling work that is dangerous, physically demanding, and increasingly difficult to staff. Push the limits of density: support component selection, stackups, and layout for power management and motor control, sensors, and communication with chip-scale packages (BGA, WLCSP, 0201/01005 passives), blind/buried vias, HDI, and board-to-board interconnects.