firmware for state of charge of lifepo4 battery and pv module

I'm looking for a firmware expert to develop a reliable and robust solution to monitor the state of charge of a LiFePO4 battery and PV module. The firmware will be deployed on an embedded platform, and will be using an RS232 or RS485 cable to communicate. It needs to be able to collect information on both voltage and current. The ideal candidate will have experience in developing efficient and reliable firmware for embedded platforms and be able to work on tight deadlines. If you think you're the right fit for this project, don't hesitate to get in touch. I look forward to reviewing your proposals! ALSO CHOOSING LOW COST MICRO CONTROLLER WHIHC IS AVAILABLE IN STOCK FOR SAME