Embedded system and software development. ARM Cortex Architecture (CortexM4, CortexA5, Cortex A53), CMSIS, ARM-debugger. Operating system: Linux, MS Window, FreeRTOS. Languages: Assembly, C/C++, C#, PHP, Java, Python, Practice Lauterbach programming(cmm script). Peripheral driver: SPI, LIN, I2C, UART, GPIO, TIMER, PWM. Hardware Manufaturer: Development kit and silicon from STmicroelectronic, Freescale Semiconductor, NXP Semiconductor, Texas Instrument, Mediatek. Platform: Halo(MAC57D54H), Kinetis(S32K144), Treerunner(S32V234), STM32F103T8C6, ESP8266, Mediatek platform (RT53xx), PIC, AVR, TI Msp430. PCB design: Altium Designer, Orcad, Proteus VCS: GIT, Clearcase, Clearquest.