Firmware (MCU)

ARM CORTEX-M0, M3, M4
8051
ANDES
RISC-LIKE: SONIX, ELAN…

Embedded system

LINUX
FREERTOS
ZEPHYR

Hardware

Schematics
PCB
EMC improving
RF matching
RF Antenna finetune

APPs

Windows tools and drivers
MAC OS
IOS
ANDROID
LINUX

DSP&Algorithms

CEVA DSP program
Audio output process
Audio input (or microphone) process
6-axis fusion

Test

HCATS(HJZ Controller Auto Test System) program
Products test
Software test
Games test