You're literally a subject matter expert on whatever you work on. It's extremely troubling if you can't catch BS'ers with a deep technical conversation. If you

You're literally a subject matter expert on whatever you work on. It's extremely troubling if you can't catch BS'ers with a deep technical conversation. If you feel the need to separately establish that they can actually code, take your pick of GitHub, fizzbuzz, etc. You're probably doing one of these before the LC round anyway.