Mastery of EDA tools: Proficient in at least one mainstream design software, such as Altium Designer, Cadence Allegro, Mentor Xpedition, KiCad, etc., able to independently complete the entire process from schematic import to optical output.
Capable of handling multi-layer board (6 or more layers) design and planning stacked structures reasonably.
Capable of processing high-speed signals (DDR, PCIe, USB, HDMI, etc.), including impedance control, timing matching, equal length winding, and crosstalk suppression.