Being a professional to understand all the requirements, and find the best way to implement it with highest quality
Software development(C/C++ Linux windows)
Hardware design(ADC/DAC, op amp, FPGA, clock, PLL, filter, power etc.)
FPGA logic(Altera Xilinx)
DSP(digital filter, modulation/demodulation, synchronization, equalization, channel coding/decoding etc.)
Embedded system design(STM32 ARM etc.)
good project management