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200 PM interview questions, with answer outlines

Every question comes with a first move, a strong opening line, an outline of a strong answer and the common mistake. Grouped by round, ready to print or read offline.

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A sample, one from each round

Product sense

Tell me about a product you use every day that you think is badly designed. How would you fix it?

First move Separate a genuine design flaw from a personal annoyance by asking who the product is for and whether the flaw hurts them, not just you.

See the opening line and answer outline

Metrics

Choose a north star metric for Airbnb and defend it.

First move Remember the two sides of the marketplace. A good north star must reflect value for both guests and hosts.

See the opening line and answer outline

Estimation

How many gas stations are there in the US?

First move Pick a demand-side path: estimate how many fill-ups US drivers need each day, then divide by how many one station can serve.

See the opening line and answer outline

Strategy

Should Airbnb get into the hotel booking business in a bigger way?

First move Ask what Airbnb's goal would be (growth, business travelers, filling gaps in supply) and whether hotels fit its brand promise of unique stays.

See the opening line and answer outline

Behavioral

Tell me about a time you disagreed with an engineer about how to build something.

First move Pick a story where the disagreement was about a real trade-off, such as speed versus quality, and where you listened before you argued.

See the opening line and answer outline

Technical

What's the difference between REST and GraphQL, and when would a PM care?

First move Explain the difference in how clients ask for data, then tie it to product effects such as mobile speed and how fast teams can ship.

See the opening line and answer outline

AI product

Design an AI assistant that helps customer support agents answer tickets faster.

First move Keep a human in the loop, so the assistant drafts replies and the agent checks and sends them. Then design for trust and speed.

See the opening line and answer outline

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Product manager interview prep you can read tonight: one method per round, 66 worked answers, 200 interview questions and a practice gym. The first lesson of every module is free.