Diagnose a drop in conversion rate

Last updated: October 22, 2025

Quick Overview

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

Postmates
Product / Decision Making
Data Scientist
Postmates
October 22, 2025
Data Scientist
Technical Screen
Product / Decision Making
Hard

3

6

580 solved


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

Product questions at Postmates test your ability to think like a product leader. This Technical Screen question evaluates how you balance user needs, business goals, and technical constraints when making product decisions.

What the Interviewer Expects
  • Demonstrate strategic product thinking beyond feature-level decisions
  • Analyze second-order effects and long-term ecosystem impact
  • Balance multiple stakeholder needs with clear trade-off rationale
  • Design experiments to validate key assumptions before building
  • Consider platform effects, network effects, and marketplace dynamics
  • Propose a phased rollout strategy with go/no-go criteria
Key Topics to Cover
Growth loops and retention
Platform and network effects
User research and problem identification
Data-informed decision making
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 sequence the rollout across different user segments?
  • What would you do if usage data contradicts user feedback?
  • How would you validate this idea before committing engineering resources?
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