How would you target promotions to grow consumers?

Q: How would you target promotions to grow consumers?

This is a Machine Learning interview question from DoorDash for Machine Learning Engineer roles. View the full question and solution on PracHub.

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Question

ML / Growth Scenario

You own a system that sends promotion offers (e.g., "$10 off", "free delivery") to consumers to increase growth.

Prompt

Design an approach to decide:

Who should receive a promo
What promo to send (offer type/amount)
When to send it

Constraints and concerns:

Limited promo budget
Risk of giving discounts to users who would have ordered anyway
Need to measure incremental lift (not just conversion)
Avoid harming long-term margin or creating promo addiction

Explain your modeling/experimentation strategy, data needs, evaluation metrics, and how you would deploy and monitor it.

How would you target promotions to grow consumers?

ML / Growth Scenario

Prompt

Solution

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