I’m building a compact, battery-powered wearable that pairs a BLE-enabled microcontroller with several low-frequency coil drivers. The core of the job is to turn my draft architecture into a production-ready design and a working, bench-tested prototype. The electronics must be laid out in KiCad and optimized for a slim wearable footprint. Clean power is critical, so you’ll need to design low-noise regulation and filtering, advise on tight EMI shielding, and route for minimal crosstalk between the MCU, the driver stage, and the antenna. On the firmware side, I need a lightweight C/C++ stack that exposes all key settings over Bluetooth Low Energy. The companion mobile app will run on both iOS and Android, so please structure the GATT profile and command set with cross-platform libraries in mind. Once connected, the firmware must generate precise, repeatable output cycles and allow me to tweak parameters from the phone. I’ll share detailed signal requirements after we sign an NDA. For now, expect multi-output timing control down to the millisecond, plus safe-start and watchdog routines so the unit never delivers unintended bursts. Deliverables • KiCad schematic, PCB layout and Gerbers ready for fab • Firmware source and build instructions, with BLE communication and timing control fully implemented • A hand-assembled, power-tested prototype that I can put straight on the oscilloscope • Short design report covering EMI measures, power-integrity test results, and any recommendations for the next hardware spin Target schedule is four to six weeks from kickoff through prototype shipment, with early design reviews along the way. If you’ve shipped mixed-signal wearables or low-noise driver boards before, I’d love to work together.