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Google·Software Engineer·Technical Phone Screen·Intermediate

Intermediate
Apr 2026

Summary

Interviewed for a business analyst role at Google, got a metrics-focused question that seemed straightforward but had more layers than I expected.

Questions Asked (1)

Q1

What KPIs would you track to evaluate the health of a subscription-based business?

Product Analytics & MetricsProduct Strategy
Author's notes

I jumped straight to MRR and churn rate, which felt obvious in hindsight.

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AI HintsAI Generated

Suggested Approach

Start by categorizing KPIs into acquisition, retention, monetization, and engagement, then highlight the most critical ones for subscription health like churn, LTV, and MRR. Emphasize how these metrics interconnect and how you would instrument them as a software engineer, focusing on data pipelines and reliability.

Pro tip: Show that you understand the difference between leading and lagging indicators—for example, engagement metrics predict churn, while churn itself is a lagging indicator. Mention how you'd design systems to track these metrics in real-time to enable proactive decisions.

1. Categorize KPIs

Group KPIs into acquisition (e.g., CAC, conversion rate), retention (e.g., churn, retention rate), monetization (e.g., MRR, ARPU, LTV), and engagement (e.g., DAU/MAU, feature adoption). This shows a structured approach.

2. Prioritize Key Metrics

Identify the most critical metrics for subscription health: churn rate, LTV, MRR, and customer retention. Explain why they matter and how they impact business sustainability.

3. Explain Interconnections

Discuss how these metrics relate—e.g., high engagement reduces churn, which increases LTV and MRR. This demonstrates systems thinking.

4. Engineering Perspective

Describe how you would implement tracking: data pipelines, event logging, dashboards, and ensuring data accuracy and timeliness. Mention tools like BigQuery, Dataflow, or Looker.

5. Actionable Insights

Conclude with how these KPIs drive product decisions and experiments (e.g., A/B testing to improve retention). Show that you connect metrics to business outcomes.

Key Points to Mention

  • Churn rate and retention rate as core health indicators
  • Customer Lifetime Value (LTV) and its ratio to Customer Acquisition Cost (CAC)
  • Monthly Recurring Revenue (MRR) and Annual Recurring Revenue (ARR)
  • Engagement metrics like DAU/MAU and feature adoption as leading indicators
  • Cohort analysis to track retention over time
  • Data infrastructure considerations for reliable metric tracking

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.