Why interviewers ask this question
This question tests discretionary effort: whether you do only the minimum required, or whether you take initiative and ownership beyond your formal job description when it genuinely helps the team, the customer, or the business. Interviewers are listening for a specific, real example rather than a general claim of being a hard worker, since the latter is easy to say and impossible to verify without a concrete story behind it.
How to structure your answer using STAR
Choose a real example where you noticed a gap or an opportunity that was not formally your responsibility, and chose to act on it. Briefly set up the situation and task, then focus on the action you took specifically beyond what was expected, whether that was staying late to help a teammate hit a deadline, proactively fixing a recurring problem no one had been asked to solve, or taking on extra responsibility during a colleague's absence. Close with a clear, ideally measurable result, and note what it showed about how you approach your work more broadly.
A strong example answer
"In a previous role, I noticed our team was manually compiling the same weekly report every Friday, which took roughly two hours and was not part of anyone's formal job description to improve. Outside of my usual workload, I spent a couple of evenings building a simple template that automated most of the process. It cut the weekly reporting time down to about twenty minutes and was adopted by two other teams once my manager shared it. It was not something anyone asked me to do, but it removed a repetitive task the whole team disliked."
Mistakes to avoid
Avoid vague answers like "I always give 100%" without a specific story attached, since it gives the interviewer nothing concrete to evaluate. Avoid choosing an example that was simply doing your job well rather than genuinely going beyond it, since interviewers can usually tell the difference. Do not exaggerate the scale of the initiative if it was actually minor, since follow-up questions will often expose inflated claims quickly.