Lunar Data Center Product Case: Why Google Would Build It, for Whom, and an MVP
Company: Google
Role: Product Manager
Category: Product Design & Strategy
Difficulty: medium
Interview Round: Other
In a product manager interview at Google, you are asked to design a data center on the Moon for Google. Treat it as a product problem as much as an engineering one: explain why Google would want such a facility and for whom, which workloads it should and should not run, how the lunar environment shapes the design, what a first version would look like, and how you would judge whether it is succeeding.
```hint Ask what the Moon is good for
List what is fundamentally different about the Moon compared with any site on Earth (distance, power, heat, radiation, access for repairs). Then ask which kinds of data or computation actually benefit from being there, rather than merely surviving there.
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### Clarifying Questions
- Is the facility meant to serve people on Earth, missions on and around the Moon, Google's own resilience goals, or some mix of these?
- Should it hold general user data, data generated in space, or both?
- Is this Google's first lunar facility, and can we assume launch and landing are bought from partners rather than built by Google?
- Are we designing a near-term pilot or a long-term permanent facility, and is a budget envelope or timeline given?
### What a Strong Answer Covers
- A credible reason for Google to build on the Moon and an explicit view of which workloads belong there and which do not.
- Prioritized users or customers with concrete needs, rather than "Google" as the only user.
- How distance, power, temperature, radiation, dust and the lack of on-site repair shape the design.
- A scoped first version with success metrics, guardrails and clear criteria for continuing or stopping.
- Major risks such as launch loss, hardware failure, regulation and cost, with mitigations.
### Follow-up Questions
- A colleague argues the Moon would make cooling servers cheap. How do you respond?
- How would you load the initial data set onto the facility, and how would you get data back if the Earth-side copies were lost?
- What results from the pilot would make you recommend shutting the project down?
Overview: A Google product design case asking you to design a data center on the Moon. It tests whether you can find a credible reason and customer for an off-world facility, reason about latency, power, heat, radiation and repair constraints, scope a first version, and set success metrics, stop criteria and risk mitigations.