-?Proficiency?C/C++?experience-?Hands?on?experience?with?RTOS?based?software?development?(uCos,?FreeRTOS,?rtx,?etc.).-?Experience?in?USB?driver?is?a?must.-?Familiar?in?diverse?communication?protocol?–SPI,?I2C,?UART?and?understand?driver?for?embedded?microcontrollers.-?Familiar?in?using?Oscilloscope,?Multi-Meter?and?other?electrical?diagnostic?tools.?Ability?to?use?oscilloscope?and?debug?firmware?on?the?PCB?is?a?must.-?Bluetooth?audio?platform?(CSR/BES/Vimicro)?is?preferred.-?Experience?in?USB?Soundcard?is?preferred.-?Working?experience?on?Linux?is?a?plus.-?Good?written?and?verbal?communication?skills?in?English?is?a?plus.