When I was working as a CTO and interviewing people I have never ever asked for a side project or a technical test, I sat down with that person having a conversation for as long as necessary in order to see how this person analyses and solves subtly presented problems.
I can teach you how to code this and that but I cannot teach you how to think with logic, pragmatism and identifying the levels of abstraction for each solution.
Search for people that can solve essential complexity.
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