Wearable Feasibility Study & Prototype — Sensors, Firmware, Data Pipeline for AI

Requirements section, written for hiring a contractor/vendor. Must have Demonstrated wrist-worn or body-worn device work taken to a functioning prototype, not concept renders Analog front-end experience with biosignals — PPG, ECG, or bioimpedance; able to justify AFE choice against signal quality targets Schematic capture and PCB layout in KiCad or Altium, including flex or rigid-flex if the form factor requires it Embedded firmware in C/C++ on a BLE SoC (Nordic nRF52/nRF54, TI, or equivalent) — sensor drivers, low-power state management, data offload Ability to produce a real power budget: current draw per subsystem, duty cycle, projected battery life at the proposed sampling rate Experience with motion artifact in optical or electrical sensing, and a concrete mitigation approach Multi-sensor timestamp synchronisation and data integrity across the acquisition chain Delivers complete design files: schematics, layout, firmware source, BOM, CAD Should have Mechanical design capability for enclosure, strap interface, and sensor window — or a named partner for it Signal validation against a reference or clinical-grade device, with reported agreement metrics BOM costing at both prototype and 10K-unit volume, with second-source options Familiarity with data pipeline requirements for ML training sets — sampling rate, format, labelling, storage Access to prototype assembly, in-house or through an established EMS relationship Nice to have Regulatory-aware development (IEC 62304, FDA wellness vs. device boundary) if a medical claim is planned later Battery and charging design experience, including wireless charging and Li-ion safety Prior work where the collected dataset was actually used to train a model Engagement requirements Written weekly updates with measured data, not narrative status Fixed-fee feasibility phase before any build commitment Full IP assignment on delivery Overlap with [your timezone] for at least 3 hours per working day Willing to sign an NDA before detailed technical discussion Please include in your proposal One prior wearable project with the sensing challenge and how you solved it Your proposed sensor stack for this application and why Estimated feasibility timeline and fixed fee Whether mechanical design is in-house or subcontracted