About the author

I'm David Kwon. I have designed circuits and boards for 30 years — high-speed digital and FPGA boards, power, and analog/mixed-signal.

The questions on this site and in the book are the ones that kept coming up. Some came from interviews I took myself over the years. Many came from the junior engineers I mentored and worked alongside — they would come back from an interview and tell me what they had been asked. And these days, more come from new graduates and master's and PhD candidates I help prepare.

Every question is rewritten as a general engineering problem. There are no company names and no confidential interview tasks, and the numbers in each question are example assumptions — the point is the reasoning.

Why this site

A book can't answer follow-up questions. Here, every question has a page where you can ask, where longer explanations go up as they are written, and where corrections are listed in public on the errata page.

Contact

Questions and corrections: ask@hwinterview.com. Please put the question ID in the subject.