[twawaaay]

That's why my personal favourite tool to manage this is pair programming with people. I do pair programming for interviews and I do longer (at least a week) pair programming projects with all my devs at some point.

It not only lets me know how the person works, how they solve problems. It lets me remediate some of the problems. And just get to know the person on personal level.

The only issue with this is it takes time and does not scale. You can honestly manage up to a dozen devs this way and when I have larger teams I have to skip it (for example I no longer pair with juniors -- I pair with seniors and then teach them to pair with juniors more productively).