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Roblox·Data Scientist·Technical Phone Screen·Senior

Senior
May 2026

Summary

A data science interview at Roblox that went deep on metric selection and how you defend unconventional choices when a senior person pushes back. One question but it had a lot of layers to it.

Questions Asked (1)

Q1

Tell me about a time you picked a non-obvious primary metric and had to defend it to a skeptical senior stakeholder. How did you build your case, what tradeoffs did you own up to, what guardrails did you put in place, and what happened when early data started going against you?

Product Analytics & MetricsStakeholder ManagementA/B Testing & Experimentation
Author's notes

This question is doing a lot of work at once and I didn't fully appreciate that until I was already mid-answer.

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AI HintsAI Generated

Suggested Approach

Choose a metric that was non-obvious but tied to long-term user value, and narrate how you built a compelling case using data, user research, and business logic. Emphasize how you proactively addressed tradeoffs, set up guardrails, and adapted when early data was unfavorable, showing scientific rigor and stakeholder empathy.

Pro tip: Frame the skeptical stakeholder as a partner whose concerns you validated, and show how you used their feedback to strengthen your metric definition and guardrails. This demonstrates collaboration and maturity, turning potential conflict into a shared success.

1. Set the Context and Metric Choice

Briefly describe the product area and why the obvious metric (e.g., DAU, revenue) was insufficient. Explain why you chose the non-obvious metric and how it better captured user value or long-term health.

2. Build the Case with Data and Logic

Detail how you gathered evidence: exploratory analysis, user research, cohort studies, or proxy metrics. Show how you connected the metric to business goals and addressed the stakeholder's likely objections preemptively.

3. Acknowledge Tradeoffs and Set Guardrails

Own up to the tradeoffs (e.g., short-term revenue dip, measurement complexity) and describe the guardrails you implemented (e.g., secondary metrics, holdout groups, monitoring) to mitigate risks.

4. Respond to Early Negative Data

Explain how you reacted when early data went against you: did you dig deeper, adjust the metric, or pivot? Show that you remained objective and used the data to learn and iterate.

5. Outcome and Learnings

Share the final outcome (e.g., metric adoption, long-term impact) and key learnings about metric selection, stakeholder management, and experimentation.

Key Points to Mention

  • Alignment with long-term user value and business strategy
  • Use of both quantitative (e.g., regression, cohort analysis) and qualitative (e.g., user interviews) evidence
  • Proactive identification and mitigation of tradeoffs (e.g., novelty effects, cannibalization)
  • Guardrails such as secondary metrics, holdout groups, and automated alerts
  • Transparent communication and iteration when data contradicted expectations
  • Influence without authority: how you brought the stakeholder along

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