Design Food Reviews, Votes, and Reviewer Rewards
Last updated: July 10, 2026
Quick Overview
Design a system that manages food reviews, votes on those reviews, and a rewards system for reviewers.
DoorDash
July 10, 202636
0
254 solved
Design a system that manages food reviews, votes on those reviews, and a rewards system for reviewers.
This question is typically asked during the onsite interview round for software engineering candidates at DoorDash to evaluate their system design skills. The interviewer is looking for the candidate's ability to think through the architecture of a system that handles user-generated content, incorporates voting mechanisms, and implements a rewards program. Candidates are expected to demonstrate their understanding of scalability, data consistency, and user engagement strategies.
What the Interviewer Expects
- Clearly define the system's requirements and constraints.
- Outline a high-level architecture including key components.
- Discuss data models and relationships between entities.
- Identify potential trade-offs and scaling strategies.
- Consider user experience and engagement in the design.
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you handle spam or fraudulent reviews?
- What database technology would you choose and why?
- How would you ensure data consistency across distributed systems?
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Practice System Design ProblemsSample Answer
Requirements
To design a system for food reviews, votes, and reviewer rewards, we first need to define the main requirements:
- User Management: Users should be able to create accounts, log in, and manage th...
High-Level Design
The high-level architecture can be broken down into several components:
- Frontend: A web or mobile interface for users to submit reviews, vote, and view their rewards.
- Backend Services: Mi...
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