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Steve, if you are reading this, any chance you can throw some light on the core skills a generalist engineer ought to know?

I'll leave it up to Steve to answer that, but this may help you get the idea:

This is a Steve's post on how he conducts and what he expects from phone interviews.

It's over seven years old so proceed with care -- it's possible that his views changed since then.

Also, this is probably more of a bare minimum rather than the whole picture.