Not to mention shipping a new feature on a codebase you are, by definition, not familiar with. I'd at least want to budget time for testing the thing. Not to me

Not to mention shipping a new feature on a codebase you are, by definition, not familiar with. I'd at least want to budget time for testing the thing. Not to mention I have severe doubts in the competence of someone who lets random interviewees edit their live code.