Write the tracking plan alongside the requirements, not afterward. Name each event, its properties, and the exact question it answers; if an event does not answer a question you have already asked, cut it. Put the plan in the ticket so it gets built and code reviewed with the feature, then verify the events in staging as part of acceptance.
Why interviewers ask this
This is a practical hygiene question that catches people who talk about being data driven but have never owned a tracking plan. Interviewers want the plan written before the build, tied to specific questions, reviewed like code, and verified before release. Anyone who has been burned by an event firing without the key property will mention checking it themselves, which is the detail that carries credibility.
How to structure your answer
- Write the tracking plan with the requirements, not after.
- Tie every event to a question you already need answered.
- Put it in the ticket so it is built and reviewed with the feature.
- Verify the events yourself in staging before release.
Example answer
The tracking plan gets written at the same time as the requirements, in the same document, and it is part of acceptance. I list the events, the properties on each one, and next to it the question that event answers. If I cannot write the question, the event does not get built, because unused events are worse than none: they cost engineering time and then someone builds a dashboard on a property that was never populated correctly. It goes into the ticket so it gets code reviewed with the feature rather than bolted on after. And I verify in staging myself, clicking through the flow with the debug view open, because I have been burned by an event that fired but had the account id missing, which made it useless for exactly the cohort question I wanted to ask. Ten minutes of checking before release saves two weeks of blind data you only notice at the launch review.
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See how it worksFollow-up questions to expect
- How do you handle instrumentation for something already live and untracked?
- What is your view on tracking everything versus tracking deliberately?
- How do you keep event definitions consistent across teams?
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