Tell me about a time you helped a struggling teammate improve, whether or not you were formally their mentor or manager.

The interviewer is assessing whether you invest in the people around you growing, and whether you can do that with genuine tact — noticing someone is struggling without being condescending, offering help in a way that respects their autonomy, and actually following through rather than just having good intentions. A strong answer describes specific, concrete actions you took (not just "I was supportive"), respects that you weren't necessarily in a position of formal authority over them, and is honest that not every mentoring effort produces a clean, dramatic turnaround.

This question probes a genuinely important but easy-to-fake quality: do you actually help the people around you get better, or do you just focus on your own individual output? Anyone can claim to be a good mentor in the abstract; the interviewer wants a concrete story that demonstrates it.

How did you notice, and how did you approach it? A strong answer describes specifically what you noticed (not a vague "they seemed to be struggling") and how you approached the conversation — ideally with genuine curiosity about what was actually going on, rather than jumping straight to unsolicited advice, since the latter can come across as presumptuous, especially without formal authority over the person.

What did you actually do, concretely? The most convincing answers describe specific actions — pairing on a specific problem, reviewing their code with genuinely constructive, specific feedback, connecting them with a resource or a different way of thinking about a problem they were stuck on — rather than a vague claim of general supportiveness.

Did you respect their autonomy and ownership of their own growth? A subtle but important signal: good mentorship offers help without taking over or being condescending — showing you gave them room to actually work through the problem themselves, with support rather than you doing it for them, demonstrates a more mature understanding of what helping someone actually means.

Honest about the actual outcome, including if it wasn't a clean success. Not every mentoring effort results in a dramatic turnaround — a credible answer might describe steady, real but modest improvement, or even acknowledge that your specific approach wasn't what ultimately helped them (someone else's different approach was), while still showing you made a genuine, good-faith effort.

Especially strong: showing you did this without formal authority. If you weren't this person's manager or an assigned mentor, describing how you offered help in a way that respected that (not assuming a role you didn't have, being invited into the situation rather than imposing yourself) shows real interpersonal judgment, distinct from what a manager helping a direct report would demonstrate.

• The interviewer wants concrete evidence you invest in others' growth, not just a claim of general supportiveness — specific actions matter more than good intentions described abstractly.
• Show genuine curiosity and tact in how you approached the situation, especially if you didn't have formal authority over the person.
• Respecting their autonomy (supporting rather than taking over) demonstrates a more mature understanding of mentorship than solving the problem for them.
• Honest, nuanced outcomes (steady but modest improvement, or acknowledging your approach wasn't the deciding factor) are more credible than a uniformly dramatic success story.

• Google: Project Oxygen — What makes a great manager