Portable Under-shoe Weighing Device Development

I am looking for a specialist to design and develop a compact, lightweight, wearable weighing device that is mounted underneath a shoe.

Requirements:
- Form factor: footprint similar to a shoe, height ≤ 2 cm
- Weight: as light as possible while maintaining sufficient structural integrity
- Mounting: attachable underneath a shoe using a strap or comparable fixation system
- Integrated display: display unit mounted on the strap (e.g. for weight or status)
- Measurement: capture of weight
- Electronics: Bluetooth Low Energy (BLE)
- Microcontroller: preferably ESP32
- Power supply: battery-operated, energy-efficient
- Build: robust, impact-resistant, suitable for everyday use

Scope clarification:
- Software (firmware and app) will be developed in-house and is not part of this project

Expected deliverables:
- Concept and design (mechanical and electrical)
- Selection of suitable sensor technology (e.g. load cells, pressure sensors)
- Circuit design and PCB layout
- Integration of the display into the strap
- Prototyping support and guidance for scalable manufacturing

Goal:
A working prototype with a clear path toward reproducible manufacturing.