When available, it can demonstrate the candidate's passion for their craft.
It showcases which technologies they would choose on their own. How they write code in their free-time / side project(s) is also a good indicator of what to expect at work.
In addition, the frequency and time of their check-ins is also a good indicator of how they spend their time. This is also an indirect indicator of "culture fit". Do they code all the time? Do they code over the weekend? Do they have side-projects? Are their nights and weekends free?
It is one of the ways to spot a 10x developer.
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