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. Between a laptop and a running humanoid there are: a C++/Python/Rust monorepo, an ARM64 cross-compile matrix, kernel modules and a real-time patch set, container images that have to land on Jetson devices, and a rollout process that cannot brick a robot several timezones away.