"Tell me about a time you had to improve or enforce code quality across your team. What problems were you seeing, how did you get others to adopt better standards, and what was the outcome?"
This question tests whether you can lead on engineering quality without relying only on authority or process. Interviewers want to understand how you define quality in practice, how you balance speed with long-term maintainability, and how you influence teammates with different habits or incentives.
It also reveals whether you take ownership beyond your own code: setting standards, mentoring others, resolving friction in reviews, and using data to improve team behavior rather than just criticizing individuals. Strong candidates show judgment under ambiguity, because “code quality” can mean different things depending on product stage, risk, and team maturity.
A strong answer uses one specific example with clear stakes: production incidents, slow delivery, rising defects, or inconsistent review quality. The best responses explain the concrete actions taken — such as review guidelines, test strategy, linters, CI gates, mentoring, or metrics — and show measurable improvement plus one lesson learned about driving sustainable behavior change.