Got the onsite interview directly since the company doesn't has HR department in their New York office. The interview was not difficult, it was conducted by their chief engineer. First was given a tour around the office, then asked projects experience on resume, finally entered technical questions. There questions are all logic, RTL design. You may be required to write code (both in C and VHDL/Verilog) but they will finally turned into logic blocks like mux, counter and adder.