Choose a project whose decisions you can explain in detail. Start with the user problem and your specific responsibility. Distinguish what you implemented, what the team implemented and what was inherited. This gives the interviewer a reliable basis for follow-up questions.
Select one important constraint and one difficult decision. Explain the alternatives you considered and the evidence available at the time. If you changed direction, describe what observation caused the change. Avoid turning the story into a list of frameworks without explaining their roles.
Describe outcomes using measurements you can defend. State the baseline, evaluation period and relevant limitations. If a result was an offline test, call it an offline result. If no reliable business metric existed, explain the operational evidence you did collect and the measurement you would add next.
Prepare a failure example. A useful account covers detection, diagnosis, corrective action and prevention. It should show what you learned about the system without inventing certainty or blaming unnamed teammates.
Practice: produce a two-minute version, then a ten-minute technical version. The longer version should add mechanisms and evidence rather than merely repeating the headline.