ARM Cortex Firmware Development

I’m working on a product built around an ARM Cortex microcontroller and need another pair of expert hands to move the firmware forward. The hardware design is already locked in; what I’m missing is clean,... (Budget: $750 - $1500 USD, Jobs: ARM, C Programming, C++ Programming, Debugging, Electronics, Embedded Systems, Firmware Development, Microcontroller, Software Development, Software Engineering)