We've been using something like this but centered around concurrency rather than networking. It works out great, you get to compare across many candidates how

We've been using something like this but centered around concurrency rather than networking. It works out great, you get to compare across many candidates how they handle the tricky parts, if they understand the standard vocabulary of concurrency, what their coding style is like and if they understand basic C++. One thing we noticed was that there is small handful of mistakes that many candidates tend to make. The ones that note the existence of a mistake or work around them skillfully are typically the best.