I have rich experience for circuit, PCB design and firmware development. - For circuit/PCB design I have rich experiences for designing over 7 years. I am working PCB design of 2 ~ 38 layers and vest high frequency for 4GHz and to 20000 pins. - For embedded system and prototype development I have rich experiences for industrial environment. I have developed many prototypes using PIC, STM32, ATMEGA and so on. -For wireless communication I have many experience about BLUETOOTH, WIFI, ZWAVE. -For battery system I have good experience to design battery system.