A Hardware Description Language (HDL) developer designs, simulates, and tests digital logic circuits and systems using hardware description languages like VHDL or Verilog. They translate system or circuit requirements into a digital design, create test benches to verify functionality, and debug any issues. They work closely with hardware engineers to ensure designs meet specifications, and with manufacturing teams for fabrication. Their work is crucial in industries like electronics and telecommunications, where they contribute to the creation of microprocessors, memory chips, FPGAs, and more. HDL developers also often document designs for future reference and improvement.