How to Answer: "Tell me about a time you mentored an underperforming engineer."

“I mentored a mid-level engineer who was consistently missing sprint commitments and producing PRs with frequent logic defects. In our 1-on-1, instead of reprimanding them, I asked open-ended questions to uncover the root cause. It turned out they felt overwhelmed by our complex distributed codebase and were reluctant to ask for help. We built a 30-day action plan: pairing on complex tasks twice a week, breaking down their tasks into sub-4-hour tickets, and establishing a 'no bad questions' environment. Within 6 weeks, their PR defect rate dropped by 60%, and they successfully delivered a major feature independently next sprint.”

“A junior engineer on my team struggled with unit testing standards. I spent two sessions pair-programming with them to write mock tests and created a cheat-sheet for common testing patterns. Over the next month, their test coverage improved significantly and they began helping others.”

“While I haven't officially managed anyone, I noticed a peer struggling with Git rebasing. I walked them through clean rebase practices and built a small reference guide for our repo workflow.”