Diagnose a drop in NPS

Last updated: May 21, 2026

Quick Overview

The activation rate dropped by 15% this week. Walk through your investigation process.

Instacart
Product / Decision Making
Data Scientist
Instacart
May 21, 2026
Data Scientist
Technical Screen
Product / Decision Making
Easy

10

2

2,251 solved


The activation rate dropped by 15% this week. Walk through your investigation process.

Instacart asks this during the Technical Screen to assess your product sense and structured thinking. They want to see how you define the problem, identify the target user, prioritize features, and measure success.

What the Interviewer Expects
  • Identify the target user and their core problem
  • Propose reasonable solutions with basic prioritization
  • Define 2-3 key success metrics
  • Consider basic trade-offs and risks
Key Topics to Cover
User segmentation and personas
Prioritization frameworks (RICE, ICE)
Success metrics and KPIs
Growth loops and retention
Competitive analysis
Go-to-market strategy
How to Approach This
  1. Start with the user. Who are they, what problem do they have, and what is their current workaround?
  2. Use a prioritization framework: impact vs effort, RICE scoring, or ICE scoring.
  3. Define success metrics using the AARRR framework: Acquisition, Activation, Retention, Revenue, Referral.
  4. Consider second-order effects. A feature might boost short-term engagement but hurt long-term retention.
Possible Follow-up Questions
  • How would you decide to kill this feature if it's not working?
  • What competitive response would you expect and how would you prepare?
  • How would you validate this idea before committing engineering resources?
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Sample Answer
Problem Framing

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