Each cartridge is a sealed, autonomous reactor controlled by a SAM3X8E ARM microcontroller. Inside: eight piezoelectric pumps, sixteen valves, a mixing chamber, 1.5–3.0 L of media storage, and a sensor array covering pH, temperature, flow, and concentration. The cartridges report to a central OBC and power management unit, which handles mission scheduling, telemetry, and the multiple bus protocols required for ESA integration — SpaceWire and RS422 for the spacecraft interface, Ethernet, RS485, I2C, SPI, and CANBUS internally. The engineering challenge is the operating envelope. Hardware that survives the vibration profile of a Vega-C launch, tolerates radiation and thermal cycling in orbit, and still delivers laboratory-grade fluid control over a full mission — that’s a different design discipline from terrestrial medical hardware. Our approach: industrial-grade components with proven space heritage, redundancy on every critical path, and an offline-first architecture so the system never depends on a live link to operate.