Hi,
I am working has a hardware and Pcb design engineer from last 3 years and also I have worked on stm32, aducm360,Atmega etc.....
So I think i can provide solution for your requirement and also please give me more details on your requirements. Price will be negotiable depends upon work.
I will help you on hardware design, PCB design, components procurement, soldering, firmware development and mechanical design so please contact me if you need any support from my side
Contact details :9448338654