Assess Need for Group Calls

Q: Assess Need for Group Calls

This question evaluates product analytics, experiment design, metric engineering, and causal inference skills, testing a candidate's ability to define and interpret engagement, adoption, retention, and quality metrics from call and DAU data.

Q: How do I approach Analytics & Experimentation interview questions?

Analytics & Experimentation questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master analytics & experimentation interviews.

Q: What difficulty level is this interview question?

This is a hard difficulty Analytics & Experimentation question, commonly asked during Technical Screen rounds at Meta.

Q: What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Meta during technical interviews.

Question

A messaging platform currently supports only one-to-one voice calls and is considering whether to launch group calling.

You have access to the same data sources used in the SQL exercise:

Table: call_events

call_id BIGINT
event_time TIMESTAMP
caller_user_id BIGINT
recipient_user_id BIGINT
country_code STRING
Assume one row per completed call attempt

Table: daily_active_users

activity_date DATE
user_id BIGINT
country_code STRING

The interviewer asks two product analytics questions:

How would you use these tables to determine whether users need a group calling feature?
If the company launches group calling, how would you determine whether the launch was successful?

Provide a structured answer that covers:

What user behaviors in the existing one-to-one call data could signal latent demand for group calls
How you would define candidate metrics, including tradeoffs between adoption, engagement, retention, and call quality
What success metrics and guardrail metrics you would use after launch
Likely confounders, selection bias, and interpretation risks
How you would design an experiment or quasi-experiment if a randomized launch is possible or not possible

Assess Need for Group Calls

Quick Overview

Solution

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