Embedded IoT Prototype Development

I have a junior engineer building the early schematics for an asset-intelligence prototype and I need an experienced embedded-systems specialist to guide the hardware design, write the firmware, and get the first units reliably streaming data to the cloud... (Budget: £10 - £15 GBP, Jobs: C Programming, C++ Programming, Electrical Engineering, Electronics, Embedded Systems, Firmware Development, Microcontroller, Rust, Sensor Integration, Wireless)