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Most people have still written code for school or a hobby project. Maybe I'm missing empathy, but I cannot understand how some developers have no code to show. If that's the case however, just let them make a small project over the weekend and then do another interview where you ask stuff about what they've made. It's not that deep |
First: they might have private code, but not necessarily code to show (I, for example, am rather not willing to show quite some of the code that I wrote privately).
Second: the kind of "code" that I tend to write privately (and into which I invest quite a lot of time) is really different from what I do at work, and what is actually considered "code" by many. It's more like (very incomplete) drawings and TeX notes about observations and proofs of properties and symmetries between some algorithms. Once finished, they will be very easy to systematically transform into a program in a computer language.
This is about very novel stuff, which to explain would take quite a lot of time.