Your question is Designing an Engagement Product Metric. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you design a product metric for assessing user engagement at NPCI?
Explain which NPCI product or user behavior you would measure, define the engaged-user population, and justify the time window and aggregation method. Cover the calculation, segmentation, validation approach, and guardrail metrics. Use illustrative assumptions where necessary, clearly distinguishing them from observed NPCI data.