What were the most memorable accomplishments in your last position?

What they are really asking

You might hear it as "What were your most memorable accomplishments there?" Either way, the interviewer wants evidence of what you can deliver. Everyone describes their responsibilities; this question asks for results. They also want to see what you value, because the achievement you choose shows what you think good work is.

The line to walk is between proud and boastful. You can be clear about what you did without sounding like you did everything alone. Say "I" for your part and "we" for the team's, and give credit where it belongs. A number helps, but only if it's real and you can explain it.

A shape that works

Problem, action, result, why it matters. Pick one or two accomplishments. For each, say what the problem or goal was, what you personally did, and what changed as a result, with a number if you have one. Finish by saying why this one matters to you. It's fine to choose something that nearly failed; the recovery often makes a better story than a smooth win.